Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a31bf9ba734ce8a…

MALICIOUS

PDF

80.8 KB Created: 2021-05-05 15:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 70f4278f60b57b077f9b6bf55c190714 SHA-1: f4a9447c8f96b9ba1359fabdb253f3a11b017bab SHA-256: 2a31bf9ba734ce8a77d63a21d2ef5fdf4cf5d5875988af0cdfb75cc6cd618d4f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs suggests an attempt to redirect users to malicious or deceptive content, potentially as part of a phishing campaign.

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://fokemale.ru/strik?utm_term=metro+2033+redux+best+weapons+reddit PDF link annotation
    • http://gosunenibunale.getenjoyment.net/biostar_x370gtn_manual.pdfIn PDF document text
    • https://mitezexevas.weebly.com/uploads/1/3/4/5/134525922/e4be69b.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/jukuzebejafukitijomez.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/elementary_grammar_games.pdfIn PDF document text
    • http://flathead.us/folisuwifi090c5.pdfIn PDF document text
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/jovudokuwobipe-pugumulelibomir-motomamebabiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5fc8bf05c47fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_6020968e25015.pdfIn PDF document text
    • https://poxesaxe.weebly.com/uploads/1/3/0/7/130738711/xivesowokuvesu_jinet.pdfIn PDF document text
    • http://genusadnlo.space/sigatosavovumifubopix168mh.pdfIn PDF document text
    • http://medway24.com/degenazinibajobagobonerkum64.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/should_i_upgrade_to_southwest_priority_card.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_b70bf892418649a8ab82bcaf87e2b9a0.pdf?index=trueIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_6a4d6f89571149ae9ceb8500314f6375.pdf?index=trueIn PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_a70bb42e8a2b4df9aab9c61824f50521.pdf?index=trueIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_1b4ac529763a46f09270d296a8a0dc72.pdf?index=trueIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_65b766ffc0564aff966758a2f18401e2.pdf?index=trueIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_f57d89dc13d34e87b2908c11899a6471.pdf?index=trueIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_ef7dc70e55e64b988b797e47a3d19d63.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_57971b48af3e4505b4499e4a48a4ca9f.pdf?index=trueIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_f5127b5eb06b4a2d93170f21b2aa9ec7.pdf?index=trueIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_ee47760c0218423c9d79246c1de09df7.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_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 5664 bytes
SHA-256: 61d351775e66e3e93882e069961114f02d42cca2fc1408166c2308d2c9abe507
font_01_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 13108 bytes
SHA-256: ca880f6645ce195672c75bcb8cd02345668f61e01c23a357c23c65aa916550e8