Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c195483104e7399…

MALICIOUS

PDF

91.0 KB Created: 2021-06-07 04:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3b20a5b5272ca482b715e11c93fce27c SHA-1: 1793fce996d2aff081172ece934ef2f6a944d0e4 SHA-256: 9c195483104e739985c5b06215328c37a71d31340f9bc71b7a56be1ab9e1079d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9995

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/pbw?utm_term=how+to+get+more+diamonds+in+superstar+smtown PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404520/normal_602e0e8d6e3df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420930/normal_5fcaa9702b804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_606a416514b5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_606dc8b0c44fb.pdfIn PDF document text
    • https://soxotinimom.weebly.com/uploads/1/3/4/8/134883838/5ea7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366347/normal_6006fb4c35803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_6032e39d7aeb4.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/zazok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444369/normal_601974fe3e756.pdfIn PDF document text
    • https://lovetawufekevo.weebly.com/uploads/1/3/4/3/134339121/1605381.pdfIn PDF document text
    • https://kosazuritejozu.weebly.com/uploads/1/3/0/8/130874521/2576710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_60638f2692c82.pdfIn PDF document text
    • https://bufetijakuvarit.weebly.com/uploads/1/3/4/8/134878832/kanolowuditona_niwileva_gipiwar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377936/normal_6042c61c9a36b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485569/normal_601835d1a8b96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_603d37e69c222.pdfIn PDF document text
    • https://gonaxazurunuta.weebly.com/uploads/1/3/0/7/130739517/8210234.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
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 2936 bytes
SHA-256: af6738d2f3aa98d96fd342bcd52b6e446681406dea2e68526d9b450973476a6c
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 5180 bytes
SHA-256: 9ef9a3ad64ad16a41bfc800fbae789f146d38ac215b570ac4a0e9319b2874406
font_02_sfnt_off00011084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 11924 bytes
SHA-256: 2d69a7afd30bc3f693e28e4a3760486dd0f2928e55c6d2e4e7c2179629e4b5ed
font_03_sfnt_off0001391d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391D 16060 bytes
SHA-256: bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d
font_04_sfnt_off00014db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3