Malicious PDF — malware analysis report

Static analysis result for SHA-256 282b7eef03b32844…

MALICIOUS

PDF

81.5 KB Created: 2020-12-08 08:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6efb70bdd69dab7861da7b66d57b65e9 SHA-1: dcf5ee3c4d42bcb25a69bbd34c5e5703d330b0e0 SHA-256: 282b7eef03b3284425dc052c53aa880d4ae0c28264e479b9f1bfa680e3bdbcd3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffnew.ru/strik?utm_term=sniper+rifle+for+sale+ireland PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413587/normal_5f9913d67f5e0.pdfIn PDF document text
    • https://jotujovogubiraf.weebly.com/uploads/1/3/4/6/134627891/9defef8.pdfIn PDF document text
    • https://fiwuvoreguno.weebly.com/uploads/1/3/4/0/134000104/df08316df477e.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/lasitoxajazug.pdfIn PDF document text
    • https://gosinixubog.weebly.com/uploads/1/3/4/8/134875818/1872228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468571/normal_5fc8b24076836.pdfIn PDF document text
    • https://lirurarupo.weebly.com/uploads/1/3/4/7/134770738/gegomeranusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5f9f059c50314.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/f4cb33c3-2448-4d32-88f2-529211678e1f/the_school_by_donald_barthelme.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe23d8cb3e0f577117d669/1606296537769/leluti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e36f1e-5c33-4a57-9478-42e07310e6f2/63411997553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80be75ec-30a0-4c57-a6da-852c550bee66/75453007543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8770671d-9cf0-49bc-ade5-882a5a3d3c22/96304004855.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13908affbf90a66ec9ac0/t/5fc4eed1eaf37e3b64372531/1606741713758/37518278340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39566de0-12d0-46f2-8d70-29493971d925/94021242766.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 12104 bytes
SHA-256: edff8c8b2816d5b683a54fb7a4eaa61b97289875ead6481979d391f9d5ba8e77
font_01_sfnt_off0000fe1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1A 5136 bytes
SHA-256: 3765df00d50f2261789bdb71b96558ed14f24a659f27fd6554ec282834a10b2a
font_02_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 11812 bytes
SHA-256: 9e18831493f90ad7733c7c5bf9b3ac4c721368f07935af3ad42ef25320817736

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