Malicious PDF — malware analysis report

Static analysis result for SHA-256 44757519b4b49a8f…

MALICIOUS

PDF

72.0 KB Created: 2021-06-07 00:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5a07b2eea8696cec618e233dd34420f SHA-1: 5ad3a81f68894c6872429ba7f52253b6c2fe6a2c SHA-256: 44757519b4b49a8fae64bcf4ef1608ef8c4a0f9b5c998a261e854ae7a3991dca
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic analysis identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious or deceptive content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs further supports the attack pattern of directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://philabc.ru/pbw?utm_term=literary+elements+in+to+kill+a+mockingbird+chapter+5
    • https://cdn-cms.f-static.net/uploads/4459916/normal_604b2a44da9cf.pdf
    • https://static.s123-cdn-static.com/uploads/4498883/normal_5fcbc83776e7f.pdf
    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/c138f7c1.pdf
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/paxilezofijolodigi.pdf
    • https://static.s123-cdn-static.com/uploads/4366969/normal_5fc7d8f818b98.pdf
    • https://cdn-cms.f-static.net/uploads/4381788/normal_60bd3eb73ce83.pdf
    • https://gixipimeno.weebly.com/uploads/1/3/4/3/134310045/679185.pdf
    • https://fonomekaleguv.weebly.com/uploads/1/3/5/3/135308628/derukabixubi_gagonexiwobid_bonagojixixipas.pdf
    • https://kogoporerosuf.weebly.com/uploads/1/3/5/3/135322240/fuwaw-xozod-xevazaf-jiwajavitil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wepoline.pbworks.com/f/wenunu.pdf
    • https://uploads.strikinglycdn.com/files/9f5616c7-466f-47e2-a77d-d7e3a1297440/pizawogobipulujuve.pdf
    • http://jifesepapo.pbworks.com/w/file/fetch/144741114/how_much_should_a_conure_eat_a_day.pdf
    • http://mitamugukojo.pbworks.com/f/edgar_allan_poe_lenore_analysis.pdf
    • http://dobifapig.pbworks.com/f/toomics_hack_mod_apk_1.3.3.pdf
    • https://uploads.strikinglycdn.com/files/d063c05e-4221-437e-a44e-984e58081670/siwudolukipogibojumiwupu.pdf
    • http://kuperuxowix.pbworks.com/f/meaning_of_information_communication_technology.pdf
    • http://ruxafonan.pbworks.com/w/file/fetch/144508677/74500417197.pdf
    • http://lorugaz.pbworks.com/f/firetejaxadekijew.pdf
    • http://noxixap.pbworks.com/f/jisiwubutaxaziga.pdf
    • http://pilujibos.pbworks.com/f/zetunapigifosokemubuwez.pdf
    • http://rujuboxu.pbworks.com/w/file/fetch/144557382/84889145437.pdf
    • http://pusavivo.pbworks.com/w/file/fetch/144555684/97584798809.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_off0000d94d.bin
b66c22fad0ac8fefe1092680a5d5df622527c0a0c31a1e12c50c91300289ef9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 5860 bytes
font_01_sfnt_off0000ed1b.bin
9d76ac6598f44111ff989d91816ae7c55e022af6d2b15c0a34dd767e1bde92f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 10440 bytes

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