Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c86b54705586fe0…

MALICIOUS

PDF

81.8 KB Created: 2021-04-06 15:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7d2cbb4480eae460c6ad2daa72039126 SHA-1: 2055828e8c3020fb0e6a457ec43c102fb708afb4 SHA-256: 2c86b54705586fe0c095dfcd87a04a15245ade6ff372a0e7a9d5554dfd85173a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or ad fraud. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=twinings+english+breakfast+tea+k+cups+nutrition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5ff8d40325fb3.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/becd26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494451/normal_5fdc1e39478ec.pdfIn PDF document text
    • https://gavaxavudo.weebly.com/uploads/1/3/4/5/134581950/jajanurefudid-konenetugazu-gegite-zopolekigam.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/8eea46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_5fdae662ecde7.pdfIn PDF document text
    • https://lewanodeb.weebly.com/uploads/1/3/4/8/134885095/9401008.pdfIn PDF document text
    • https://lepifopinitomo.weebly.com/uploads/1/3/2/6/132696280/gaxuvakodejidojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467003/normal_5fe0f533195e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/21706837109.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_5d764f9e0d274d2e9c4255d2d25da11d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8759410-19cc-424f-8446-e05c8b7a87ac/can_type_1_diabetics_be_on_keto_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/24377399519.pdfIn PDF document text
    • https://d7e981a8-8c4a-445e-aef0-60d3d4911bd2.filesusr.com/ugd/65d69c_7ed45d471dce4e44b804d775ac2a0af1.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_18299b8265ee45a4a2353a02ae46e913.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/html5_portfolio_template.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_a4eeef2ed9f44b0eb0db743d89cb70eb.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_8f4729e45ce2469f897e7ecb3d997618.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9cf2554-4be7-421d-9d4c-d81d75d91a44/periodic_table_blank_worksheet.pdfIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_2ad0f6d1ecb44d569c695ec50022cf30.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_f9c6d0881c244f039a71953c6608af33.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 5404 bytes
SHA-256: 94c89bba703c4946dc2fbeaced688bc7c76daf1ff694f7142e418c7315af80fb
font_01_sfnt_off0001040f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 11804 bytes
SHA-256: 16be822a843c3233fe3f80af146f7759eccebd10282c582608fa034d1ea8c422
font_02_sfnt_off00012b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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