Malicious PDF — malware analysis report

Static analysis result for SHA-256 929d2b4cb971774b…

MALICIOUS

PDF

71.2 KB Created: 2021-03-02 04:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 196cc5c10643e20ab563d025201547b7 SHA-1: d5f636186f7c53919dad51418c8a3c3305f3cab0 SHA-256: 929d2b4cb971774b995dcdb0a45d423b110c6a3476a6c0dbf84c5b8a1f97cd3b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall heuristic findings indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=diary+of+a+wimpy+kid+movie+4+rodrick PDF link annotation
    • https://tuwebuliwarukor.weebly.com/uploads/1/3/5/4/135400964/9860833.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/3gdjehj/4561280117.pdfIn PDF document text
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/29cd5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464297/normal_5fdfdefc3fda8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_602cfe8e6ab54.pdfIn PDF document text
    • https://galevegu.weebly.com/uploads/1/3/4/5/134507196/2203742.pdfIn PDF document text
    • https://zanokelalugabu.weebly.com/uploads/1/3/5/3/135315143/f7ebabcb1e6fbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_603bd2d06449c.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/jh7ICQr/69068525930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_6030dbe82b883.pdfIn PDF document text
    • https://pekatube.weebly.com/uploads/1/3/5/3/135393066/suzuja.pdfIn PDF document text
    • https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/novifude-savuxuvefu-pazuraruje-dewadazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418192/normal_602cf9a3ab872.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/DBgeFjj/hepatitis_deaths_per_year_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/gsEF5yr/numopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugujub.onlinewebshop.net/98690971044.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_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 5496 bytes
SHA-256: d5165bb5c4a249fe5308849189954d61251e30708adb715432f7cb635715ed1e
font_01_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 9880 bytes
SHA-256: 47b1a3ed3d54179c15c9a1691c25f8759c8f0d48fb8c66d670c05e42fd1eecd0

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