Malicious PDF — malware analysis report

Static analysis result for SHA-256 290a0351e9e81330…

MALICIOUS

PDF

64.0 KB Created: 2021-03-24 22:24:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1d548bf563a779b29f0f980e5400e046 SHA-1: dd2b191c5a2a8ad0e8e807dd37d3529be4d5e369 SHA-256: 290a0351e9e813303eac28ab24fda9209c6e942c83e4059be4bdac66114a644f
184 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ClamAV and an ML classifier, and contains a large number of external links, many of which are on disposable hosting. The primary URL, 'https://seumenha.ru/123?utm_term=adalat+1976+movie+songs+free', suggests a link farm tactic. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

Heuristics 5

  • 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
  • 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/123?utm_term=adalat+1976+movie+songs+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410679/normal_6034749592060.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419003/normal_5ffb404e98b15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_60280320813d8.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/gjjhjar/49503475231.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371258/normal_5ff18817c0592.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/tgcnTgi/niximixegosigudivagor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_9cd5a1e233c440089dc8d2bfa26633ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libeganot/font_acme_gothic.pdfIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_6e67e517f67b45338610809cbfa5633a.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_d832157911584261ae51882c9ff5dca3.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_2ba4c9aa90e44dea867b61931623dafc.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_1bc7a84effdb41fe9ff6e21403eb83e1.pdf?index=trueIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_69752f460e2643319433fa7f0f93eea8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/honda_self_propelled_lawn_mower_maintenance.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_7da12e8233e24245802954bd2c4d171f.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 5716 bytes
SHA-256: 519af81a408d7cea1dea48529341bfcf4df5dbc3202b2ecf8fecc7f782267323

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