Malicious PDF — malware analysis report

Static analysis result for SHA-256 471f07e8c03195a2…

MALICIOUS

PDF

82.2 KB Created: 2021-03-27 12:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e3b093170ff32a58cdae97107cd95baf SHA-1: 521610cd965fa83bccb25152a971cf7498baefe6 SHA-256: 471f07e8c03195a261646922a7d5598bd7182e88daac2b59c6d51dbbc04ca27b
332 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits multiple indicators of malicious activity, including a critical heuristic firing for linking to known malicious redirector infrastructure. The document also contains a mass external PDF link farm, suggesting it is part of a larger phishing or SEO poisoning campaign. The presence of a payment redirection lure strongly indicates a business email compromise or financial phishing attempt. While no scripts were explicitly extracted, the ML classifier and ClamAV detection confirm its malicious nature, likely exploiting PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/award?keyword=andhra+bank+savings+account+application+form+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_603a794b56f5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_604dc6167696f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_60511ee51b019.pdfIn PDF document text
    • http://astropsychology.website/applocker_logs_powershelltd0jl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_600d6a9161c67.pdfIn PDF document text
    • http://itfamily.pro/best_interior_designing_courses_online8bsuo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5febb6d68858d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_00f7810094c44efab39d057d367ed2f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e517a02-5986-4dce-8250-9bfea0b6059f/bissell_power_steamer_duo_pads_2078k.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_3665897e97b84433b4aa2f9e64297856.pdf?index=trueIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_4078a41b1d88472c93233a2968a9747c.pdf?index=trueIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_d51c4639579445ccafa55a23300eaf72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85b65f4-c7d0-4145-9af0-b8b910d4d5b2/xovajawin.pdfIn PDF document text
    • https://62619d47-812b-4c4f-a232-aa08d86264e8.filesusr.com/ugd/6d62c1_8f5f6720da454aa795acba5869f1399c.pdf?index=trueIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/8a86841a-ea96-442e-b802-a01b27d3b00f/88678022627.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_ce91c085659740f9b4398ddb3baeac9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d376ec8-6fb0-4cb9-9217-afbae791585d/asp.net_interview_questions_and_answers_codeproject.pdfIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_33b5a285ca164d59937296123368b26c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c6c48a-d311-4e1c-a11e-acde6763f08e/pudizifukunaziximivexi.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_b18eff6637624488ba8af56fb2f33122.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://uploads.strikinglycdn.com/files/In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 5824 bytes
SHA-256: 01d8c0220cdd6fec0923560ebba64de84d86dec846049dfc090ed902da10f7a1
font_01_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 11096 bytes
SHA-256: aef967ac67c94499f5e83d2c438b5c3c39023134768db78c62adb6255e41e500

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