Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4c8f3ddf6e78c4…

MALICIOUS

PDF

68.7 KB Created: 2021-06-10 10:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9669bbafad80eb59ac6033ec040af9bd SHA-1: 5eb15f67a73b1980644716eb8a4d14ff7a5cc428 SHA-256: af4c8f3ddf6e78c425ddc9b207e8e0858544b85818b7cfd31aa780a4cc108f4e
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for brand-impersonation credential phishing targeting Apple. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. One such URL is https://smidgel.ru/pbw?utm_term=video+download+music+mp4, which is likely part of the phishing campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zupikadi.weebly.com/uploads/1/3/4/6/134667234/acb51b5b3154e60.pdf.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://smidgel.ru/pbw?utm_term=video+download+music+mp4 PDF link annotation
    • https://zupikadi.weebly.com/uploads/1/3/4/6/134667234/acb51b5b3154e60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5fc679b405401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_601da101edea6.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/7067311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_601fc667bcf61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405186/normal_5fefd1a9b0afe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391315/normal_5fc90abf87187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_60198d63d3e55.pdfIn PDF document text
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/kefus_panutofobofu.pdfIn PDF document text
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/8331484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7011a8f-e030-4e00-b63a-1b55bb4a8bdc/ghost_boy_felicity_pulman.pdfIn PDF document text
    • http://fevuxowina.pbworks.com/w/file/fetch/144577353/manual_radio_qyt_kt_8900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/988243b1-f4a6-4322-afed-61c1114d35d7/how_to_turn_on_a_bose_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8074130b-0b8c-4432-b609-0451e4256218/shaded_red_smooth_dachshund.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8fb804-e680-4e27-ba53-e2626e161037/97708339230.pdfIn PDF document text
    • http://zipiwume.pbworks.com/w/file/fetch/144820533/capital_one_account_restricted.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81927fc-b9db-4613-83cf-b5f4c7f64c67/how_to_calculate_expenditure_budget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f190a1-ec16-4598-b53d-1eaf0630ea96/flipkart_hack_mod_apk_download_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c492094-95cf-4f90-a3c0-21da479a4a2b/gikozulivopowegik.pdfIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 5268 bytes
SHA-256: 8aceb059132090b649450e60fdd7fe9ed7f6c258898205ebd8dda1f8a13c202c
font_01_sfnt_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 10548 bytes
SHA-256: fd1e21ab90c51d4add47cb81d015427f3ebcf7f907da9cdf99f8d75b05c2b420

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