Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4dce2d614c4104…

MALICIOUS

PDF

73.2 KB Created: 2021-03-31 18:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 520870eeda83020301ea97764a56157a SHA-1: b3123697db1a7579e0d0634f387cefcfc59ded01 SHA-256: 2f4dce2d614c4104d84acbb251c019693147c59170af05610f0a9db89ac3b74a
186 Risk Score

Malware Insights

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

The PDF document contains a lure related to installing a Comcast DVR cable box, which is highly suspicious given the file's malicious verdict and the presence of numerous external links. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and the ML classifier strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=how+to+install+comcast+dvr+cable+box PDF link annotation
    • https://cdn.sqhk.co/tikisudolo/gcrgiie/pudanovitosesozo.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/kipusizageneximivija.pdfIn PDF document text
    • http://zeruxejobimal.mywebcommunity.org/alok_ranjan_dasgupta_kobita_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kowalaxu/ha2hcji/vakotomuvab.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/hbUDYij/tebepazolikadixamitodu.pdfIn PDF document text
    • https://cdn.sqhk.co/wulupumiwi/xggkieU/herculite_80_datasheet.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/yDhjidh/xewefaz.pdfIn PDF document text
    • https://fafovufurivu.weebly.com/uploads/1/3/2/6/132695925/f3fbb4d34e6.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/cjhgdjd/influence_peddling_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/ridasozewe/Wgg0jag/badminton_court_size_in_feet.pdfIn PDF document text
    • https://cdn.sqhk.co/dodipenameki/waUicgj/nudakilekonabiwuw.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxeneson/jhgeYCd/jagenimiralejalivenesana.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/jegaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_1e0d280e32b9458cb25db616f0927b32.pdf?index=trueIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_50d09dba802142c6a7ca6119f1fd1b42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/24281862182.pdfIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_6957f3da2ae24912826d07448ac7c432.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/64346010432.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/english_sentence_structure_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/dream_on_aerosmith_song_free.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/pokesabivusajezavadak.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_b3831ea9190849fea9f6147e25e23fc7.pdf?index=trueIn PDF document text
    • https://8cff2b46-3289-4d4c-b6d5-84761b4963bb.filesusr.com/ugd/c91274_7beac734d2fe4510baa150ce6a9a3d87.pdf?index=trueIn 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_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 5404 bytes
SHA-256: 1b3196123c9076e5d91f22e4d2bb22dc2fed640268cf591a2158d26fe84ca589
font_01_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 9772 bytes
SHA-256: 98c9e4d33d109dc297466dbecb21287810c182366f61a8a293097c6b0094da8e