Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b1519222afaed3…

MALICIOUS

PDF

80.4 KB Created: 2021-04-17 16:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f724828c8ca88b0cb4aecfeb198c30d2 SHA-1: 2ddc2e790c62d3619c8fad39a3bf74da90c98f0a SHA-256: e9b1519222afaed3b7f5daf64d633e0bff87d90c1dac9d6ca56dfe139095d062
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=guitar+mastery+method+101+review
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/b9cd4a7b9d06.pdf
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/zesuja.pdf
    • https://lisufijefe.weebly.com/uploads/1/3/2/7/132740260/8698941.pdf
    • http://lojuxaga.mywebcommunity.org/atomic_structure_and_periodic_table_worksheet.pdf
    • https://noxetetejiv.weebly.com/uploads/1/3/4/3/134391164/sewogamex.pdf
    • https://cdn-cms.f-static.net/uploads/4371807/normal_6023bb27237c5.pdf
    • https://temisufe.weebly.com/uploads/1/3/5/3/135384001/8689530.pdf
    • https://cdn-cms.f-static.net/uploads/4401558/normal_604c97a31d22c.pdf
    • https://cdn-cms.f-static.net/uploads/4492586/normal_6063770c321f9.pdf
    • https://cdn-cms.f-static.net/uploads/4391642/normal_6010a44575666.pdf
    • https://gadetuzajuvi.weebly.com/uploads/1/3/4/8/134850054/85148.pdf
    • https://fesimubigezati.weebly.com/uploads/1/3/4/5/134515628/7499615.pdf
    • https://kesevure.weebly.com/uploads/1/3/4/4/134497963/9838478.pdf
    • https://ninobajoxakatud.weebly.com/uploads/1/3/4/7/134702009/xujix_nosukudexo_zibepigefuxamer.pdf
    • https://bibevugu.weebly.com/uploads/1/3/1/4/131406802/jozigud.pdf
    • http://pakirekugep.scienceontheweb.net/64980330436.pdf
    • https://muxetomanudone.weebly.com/uploads/1/3/1/4/131406273/6282187.pdf
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/6016116.pdf
    • http://forovasax.medianewsonline.com/mr_coffee_12_cup_programmable_coffee_maker_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4366369/normal_6016b72a990f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gubazit.epizy.com/lucky_movie_chori_chori_song.pdf
    • http://levipazik.epizy.com/34407016613.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_off0000f995.bin
4f0f9b28d127ca248a20797c59eb9ff4cb7682b6a1c4614b66eb3fc4532e520a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 5512 bytes
font_01_sfnt_off00010c41.bin
23a5375241cc975c3823e550673410c52bcdf5dfa03843a72c4d1ae609202a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 11228 bytes

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