Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2d9d280c6ffbfa…

MALICIOUS

PDF

75.4 KB Created: 2021-05-08 20:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42eaaf3700bd5163ce6ca3f12e22fe4e SHA-1: ba5d94fa73909e1e5df84b9a286ac106acc0b88f SHA-256: 0f2d9d280c6ffbfafb7f1fd7eed77a67d834565e7e0fcc07db3af8a351531eff
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV detection and ML classification confirm its malicious nature. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://druttle.ru/strik?utm_term=beats+studio+3+wireless+review+gym
    • https://cdn.sqhk.co/dubikewe/idihijS/42312239800.pdf
    • https://cdn.sqhk.co/noruwotil/ggePi4C/liverpool_vs_bayern_munich_bleacher_report.pdf
    • https://cdn.sqhk.co/lugenaru/ekgi9lv/red_velvet_cake_pops_easy_recipe.pdf
    • https://cdn.sqhk.co/gunonutib/ijjcux1/20425639512.pdf
    • https://cdn.sqhk.co/xewimoziwuvo/ggIjhFF/now_you_see_me_2_movie_star_cast.pdf
    • https://cdn.sqhk.co/forexidof/dhgrvcx/secret_dialer_codes_for_samsung.pdf
    • https://cdn.sqhk.co/juzosugun/dLjaihY/mars_rover_2020_name_sign_up.pdf
    • https://cdn.sqhk.co/sudidoxa/yrhS3gg/91329847289.pdf
    • https://cdn.sqhk.co/xusikeko/sgjaNhh/beard_straightener_comb_for_short_beards.pdf
    • https://cdn.sqhk.co/xunijejozi/jbjg42o/59239659463.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muwemivumazulax/aisi_laagi_lagan_song_javed_ali.pdf
    • https://s3.amazonaws.com/tezofuretejom/anemia_de_celulas_falciformes_y_embarazo.pdf
    • https://5d55c623-01b0-417f-8131-8dfd0334080c.filesusr.com/ugd/9ef046_d2c4c8042d874769b55fe96c4ae89705.pdf?index=true
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_efaf25b7c8854b46ba5c48873cf0cb44.pdf?index=true
    • https://s3.amazonaws.com/nufidibodudulad/tiken.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_off0000dd92.bin
cadb95258ac5f1d90bb9862d41f4a54cc63e677b6985240c74106cd21481e51e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 5612 bytes
font_01_sfnt_off0000f0b3.bin
cab0366e7d83470d0dd2c866fe2a74caf407c8f9ae2ed395a2c4c739c91a22e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 21416 bytes