Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1008a3fa235d08…

MALICIOUS

PDF

75.2 KB Created: 2021-06-09 22:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7363dbda6221a78e46c0d11cf6e0363 SHA-1: 69a2441dbd908437b073aad3b868006dd8d46506 SHA-256: 0a1008a3fa235d0888e6f9fb1f1eb2a558cc6ac48d4c074d0d9e1d9b634fc3a2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. While no scripts were directly extracted, the presence of external links and the overall structure point towards a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/pbw?utm_term=vijay+old+mp3+songs
    • https://fazajamol.weebly.com/uploads/1/3/2/7/132740605/20c6396be578.pdf
    • https://static.s123-cdn-static.com/uploads/4469847/normal_5fc843d705e2a.pdf
    • https://feselezoretun.weebly.com/uploads/1/3/4/6/134690260/bilinog-zoluruv-numinadinigen.pdf
    • https://zagajubigifebig.weebly.com/uploads/1/3/4/7/134773219/586282.pdf
    • https://static.s123-cdn-static.com/uploads/4463565/normal_6004e62b96e1c.pdf
    • https://piloseweme.weebly.com/uploads/1/3/4/4/134491853/2865437.pdf
    • https://cdn-cms.f-static.net/uploads/4412593/normal_60311fdc7fff2.pdf
    • https://cdn-cms.f-static.net/uploads/4417213/normal_605574620eaa1.pdf
    • https://cdn-cms.f-static.net/uploads/4420588/normal_605016797d099.pdf
    • https://cdn-cms.f-static.net/uploads/4501770/normal_5fd22f86ca025.pdf
    • https://viluvaxev.weebly.com/uploads/1/3/5/9/135974466/nowotepedirek.pdf
    • https://gorasamigizutod.weebly.com/uploads/1/3/4/6/134600185/5352696.pdf
    • https://nigepopevoxi.weebly.com/uploads/1/3/4/8/134881291/minowinubeniwamigor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xozojonurom.pbworks.com/w/file/fetch/144547779/aptitude_questions_answers.pdf
    • http://xiwesamoneni.pbworks.com/f/need_for_speed_most_wanted_file.pdf
    • http://zanopadik.pbworks.com/f/45057461742.pdf
    • http://xobapotowi.pbworks.com/w/file/fetch/144558765/zinda_bhaag_milkha_bhaag_mp3_song_download_320kbps.pdf
    • http://gemometis.pbworks.com/w/file/fetch/144843021/substitution_property_of_equality_definition_and_example.pdf
    • http://sajateves.pbworks.com/f/kerebetusujozuwaxosazu.pdf
    • http://saxonax.pbworks.com/w/file/fetch/144652305/18217132363.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_off0000e7a3.bin
828567327450032577b36b0738cac2e17b8e124ba430f2ce6aa76120f7a30696		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 5492 bytes
font_01_sfnt_off0000fa57.bin
a2dd9a6aa0439fa9f546f1c3c41af119411dae41139fc5c81ce5864eb3067611		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 10984 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.