Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c4097edae330c2…

MALICIOUS

PDF

61.4 KB Created: 2020-12-19 15:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 60e6120817fcf34cab7e28bc9c2f044b SHA-1: 7fc50e0779bbfea42681092cd87e846c01ae2fa8 SHA-256: 95c4097edae330c24ca88bd3d487bc45431d6ee504c30e0cca73102aebb272be
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one critical heuristic identifying a 'PDF_SEO_LINK_FARM' pointing to a suspicious URL. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded links and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=popcorn+ceiling+removal+tool+with+bag PDF link annotation
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/wovexofek.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/44c50ee0b617beb.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/1445006.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://uploads.strikinglycdn.com/files/1101de33-e21c-42bf-8b06-218165630dc2/sevusiditutopiminujegas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde06de7-bc9a-4d2e-ba5d-4a3cd471ef36/80977612489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e406a7-b606-48fd-824d-7aaef9fb3044/38831275222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d93b37-506c-424c-baa6-bc56daea849a/age_of_kings_skyward_battle_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d080df2-b7c4-42e1-ab2a-d6a122a4705b/fulufeni.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfe6b3c6ccf69f324c2da/1606286955688/reddit_summoners_war_rune_optimizer.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_off0000a90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA90A 5248 bytes
SHA-256: d887cdd4f0f321da1bc1360ad70112b8a75ab32e984138f3f2a5fa5eb22e907c
font_01_sfnt_off0000bab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB2 9504 bytes
SHA-256: 267189ada59bb2bf06f167bea93c2cfda04857a402d225ed45003528ae6b9779
font_02_sfnt_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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