Malicious PDF — malware analysis report

Static analysis result for SHA-256 91039de2be383919…

MALICIOUS

PDF

69.4 KB Created: 2021-02-08 15:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a526e6fd6cb2969fc8af848542635c84 SHA-1: b62801c9a0428724f4c84d4d27866455849f997e SHA-256: 91039de2be38391913f5e54c22deab0ffe83f149684408f078c1d6ef156e6194
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to drive traffic to external URLs, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/wb?keyword=cake%20decorating%20made%20easy%20pdf PDF link annotation
    • https://kapuwibipu.weebly.com/uploads/1/3/0/9/130969563/4e5411eb0b.pdfIn PDF document text
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/7411129.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/bsDIFJf/gasujarozizivaleg.pdfIn PDF document text
    • https://zunejafeg.weebly.com/uploads/1/3/4/3/134382709/61430bf3.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/fukuduz.pdfIn PDF document text
    • https://rapowude.weebly.com/uploads/1/3/1/4/131454581/rogasa.pdfIn PDF document text
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/fd30e85.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/3638860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_601aa3d980c12.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/1liibA4/kisifaweritelixusetebugiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374196/normal_5fde8b4bbb6b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445118/normal_6015c220916a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5fe5d26886a57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/algebra_2_equations_and_answers.pdfIn PDF document text
    • http://logasexa.epizy.com/ccdp_300-_320.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/21684223713.pdfIn PDF document text
    • http://dovagoxaluzof.rf.gd/heathlands_care_home_cqc_report.pdfIn PDF document text
    • http://mowigefugitixa.epizy.com/6696712697.pdfIn PDF document text
    • http://fifomivosa.rf.gd/gopro_hero_4_black_settings_cheat_sheet.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_off0000d180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 5516 bytes
SHA-256: 8b9764c0f9684e790d75f72800ae7f3ceb8448b1f9f8e9ce258396bd16124dda
font_01_sfnt_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 10704 bytes
SHA-256: ba5151576493a3ccc1dcf12788d7950801759e1680179ee0788994f12511846d

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