Malicious PDF — malware analysis report

Static analysis result for SHA-256 376298406ddfd4e6…

MALICIOUS

PDF

70.3 KB Created: 2021-01-19 18:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35fe7768411940313d719c689af7c14c SHA-1: d5bdb2559e8542c379c1f928d602985dfc615989 SHA-256: 376298406ddfd4e6777f38373dfa914397b919bb2195c81a9ac07b9aabc5553a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate an attempt to redirect users to potentially malicious sites. No scripts were extracted, but the overall structure and link distribution suggest a phishing or malware distribution campaign.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/123?utm_term=ryobi+battery+warranty+australia
    • https://cdn.sqhk.co/duputokodoz/sIwighb/super_sonic_the_hedgehog_speed.pdf
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5fdb1acbf0c21.pdf
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/6690056.pdf
    • https://cdn.sqhk.co/wufevinek/ajggijh/lerororubusog.pdf
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/9f82e1d33070dc.pdf
    • https://cdn-cms.f-static.net/uploads/4385436/normal_5fa4e4a7904e7.pdf
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f8dc9a61cfb3.pdf
    • https://cdn-cms.f-static.net/uploads/4476148/normal_5fae9bc4cbde9.pdf
    • https://cdn.sqhk.co/komajekolino/2FDbjYV/xarogatutaz.pdf
    • https://cdn.sqhk.co/konidadelan/8ajiggi/saropojodezelepitekagume.pdf
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fd89da1b476f.pdf
    • https://cdn-cms.f-static.net/uploads/4426551/normal_5f9c18b72a80c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bopuxosavubare/free_monthly_budgeting_worksheets.pdf
    • https://s3.amazonaws.com/figugipopar/zinonarujubuzadopisu.pdf
    • https://s3.amazonaws.com/zasepo/periodic_table_practice_answer_key.pdf
    • https://s3.amazonaws.com/jinabom/kalokokenupabakatab.pdf
    • https://s3.amazonaws.com/woberiz/concepto_de_pedagogia_segun_autores_actuales.pdf
    • https://s3.amazonaws.com/tidigudetefumof/3d_platformer_rpg.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_off0000d95a.bin
b8dca4376d1b2a28427705c9393a871ea829f96d09ba1817580be7a0bffd0855
pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 5020 bytes
font_01_sfnt_off0000ea97.bin
556f10277c827ba1c340e550614043bb48e0623becf58d9b5ed9f9c783f77aab
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 9884 bytes