Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3fe7700c38ab4e…

MALICIOUS

PDF

72.6 KB Created: 2021-02-18 08:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: af9e3c680b66809d25659ce14e774b20 SHA-1: 97288b081e0e3d71bad2f4bce22cd90a81c27274 SHA-256: ae3fe7700c38ab4e2d11bcaf81dfc0b6ca8833764dcaa347a8c0d936df20d23f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, indicating a link farm designed to direct users to potentially harmful content. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content that can mask malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wb?keyword=murray%20riding%20lawn%20mower%20ignition%20switch PDF link annotation
    • https://felelitujafi.weebly.com/uploads/1/3/5/3/135392562/wubawuviriviriz.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/jgQ3NeP/planet_fitness_locations_in_yuma_arizona.pdfIn PDF document text
    • https://tipidaxu.weebly.com/uploads/1/3/0/7/130739537/gaparokadutada.pdfIn PDF document text
    • https://zudejuzire.weebly.com/uploads/1/3/2/6/132681250/lixugavenil-xojidiji.pdfIn PDF document text
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/bitisopef.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/jhin_build_guideinpf3.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenixa/bsAXOij/running_monster_summoner_war.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/ifhjEib/modern_furniture_style_names.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479470/normal_60043ce057403.pdfIn PDF document text
    • https://cdn.sqhk.co/fesoxuleri/ib5ij0v/destruction_derby_2_pc_full_game_download.pdfIn PDF document text
    • https://saduzoxizujakef.weebly.com/uploads/1/3/1/0/131071125/jijed_kobijun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/34851948634.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/boss_tone_studio_katana_100_212.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_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 5552 bytes
SHA-256: 2391a6572c3be81696a99c54f61f9859e8d5db5b4ab66c04823f52760f45d7a1
font_01_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 10484 bytes
SHA-256: 75d1563192aa0520b414c37c0deeabdc2ce1fa0f9e1771e112f351cefc69a575

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