Malicious PDF — malware analysis report

Static analysis result for SHA-256 3676c57b9cc3d3f7…

MALICIOUS

PDF

71.5 KB Created: 2021-04-26 20:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b5284ddff082b67580448c838d4f0505 SHA-1: d183a66dc153ce652f45c340829a03897544ee4d SHA-256: 3676c57b9cc3d3f7e454dd8b457f89394df97cb0b8673eb72e5b10d55528f6f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to PDF files hosted on link farms, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://seumenha.ru/strik?utm_term=how+much+is+a+moped+service PDF link annotation
    • https://cdn.sqhk.co/kesufetumo/heR1Tjc/52145759255.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/cUyv46B/60017631766.pdfIn PDF document text
    • https://cdn.sqhk.co/wenavuso/cgBicia/naredofig.pdfIn PDF document text
    • https://cdn.sqhk.co/pikikunifav/iaVjiN3/35662372108.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumila/idjgjjN/51030560650.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/haXmj1j/76107864033.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/Ijbkgex/6101011166.pdfIn PDF document text
    • https://cdn.sqhk.co/banijuwa/vib2Qib/jigitobebumenetopiwenalig.pdfIn PDF document text
    • https://rategojo.weebly.com/uploads/1/3/0/7/130739688/2173470.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/d3fc54ae.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/wgdhchW/zefikepajutunupepiwafaj.pdfIn PDF document text
    • https://puziwifatewir.weebly.com/uploads/1/3/4/7/134715637/2cebf6adab8de.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/jaihjhZ/cartilage_vocal_cord.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/Zhf6jcM/33271288112.pdfIn PDF document text
    • https://katifakemu.weebly.com/uploads/1/3/1/3/131381151/7184068.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/dxljd8q/wyvern_breeding_ark_crystal_isles.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/cgjuVha/life_and_death_twilight_movie_cast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD884 5396 bytes
SHA-256: 7853a53602a5510c4891d1f95490d4fa4f49d415e225173f7ddc0fa208d13cec
font_01_sfnt_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 10840 bytes
SHA-256: 57b5327a793ba87551b46a9d4d9d73c47306390edf7cb1c542c7e1ed9cccf0c9

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