Malicious PDF — malware analysis report

Static analysis result for SHA-256 4687694ab0138570…

MALICIOUS

PDF

65.9 KB Created: 2020-12-14 17:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9374529f3cee8fc5c7c53d103b08c58 SHA-1: 56735f2a454760cbd276bf544531f9cd66b6908c SHA-256: 4687694ab01385707510e3ff16c535b2f918987bc9388af307b32cb90ae1ea0d
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The embedded URL `https://trafffi.ru/strik?utm_term=bergen+county+clerk+phone+number` indicates a lure related to a specific search query. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://trafffi.ru/strik?utm_term=bergen+county+clerk+phone+number
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/rimibefobaves.pdf
    • https://cdn-cms.f-static.net/uploads/4473971/normal_5fab758b501b2.pdf
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/9302421.pdf
    • https://static.s123-cdn-static.com/uploads/4375209/normal_5fcd5cc02ead0.pdf
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/5665122.pdf
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/9f0f71ba.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/vefuw.pdf
    • https://cdn-cms.f-static.net/uploads/4474456/normal_5fae9ca5e0811.pdf
    • https://cdn-cms.f-static.net/uploads/4445555/normal_5fa0559eb0f17.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kotenu/bad_north_trophy_guide.pdf
    • https://uploads.strikinglycdn.com/files/4eade1c1-2a0d-40a4-b154-99be9fad55a8/lopetuxob.pdf
    • https://s3.amazonaws.com/wazotojemov/calf_strengthening_exercises_for_runners.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/tosijanoxovenobozu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c574.bin
05577fb98fcfac4e233f3cf0726cddec83720f7bfa846154e262db0d92f86729		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC574 5316 bytes
font_01_sfnt_off0000d770.bin
2ef1345cfc61c48ba8cb7ce20e9e6964d4ab57fb3c506c7fb1c6e961993d0349		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 10500 bytes

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