Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd89b0d8b5b5b71…

MALICIOUS

PDF

67.2 KB Created: 2021-03-14 18:03:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9603ce7cadbffe3efa76dc17b3e510b3 SHA-1: d84f1f016ff83fdb320ce213ebea1c59d4ea2c01 SHA-256: 4fd89b0d8b5b5b71699d33689d105bfa64c09bbfbd6d5650aea03679686bc564
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://mezovuduw.ru/123?utm_term=auto-+tune+evo+5.+0.+8+vst PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471688/normal_603fa4c48194b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_603401543dbf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_6011545ec33e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_5fd657a630d22.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/gWmgcGe/funny_captions_for_instagram_pictures_with_girlfriend.pdfIn PDF document text
    • https://cdn.sqhk.co/xowoluve/3Y2geis/67303087834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_5fd234d42c4e5.pdfIn PDF document text
    • https://cdn.sqhk.co/kosibowo/7dHrCig/chef_fever_crazy_kitchen_restaurant_cooking_games_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404976/normal_6049ee2909de0.pdfIn PDF document text
    • http://rajajime.mypressonline.com/10651012698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5fd995247b078.pdfIn PDF document text
    • https://cdn.sqhk.co/wexapitode/R3hcjiQ/jojefudejopudomaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417119/normal_5ff07e876f40e.pdfIn PDF document text
    • http://xajavawinereko.mywebcommunity.org/86389654900.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/12962994614.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_0d91d4344b2348ca95a25c603c49fd22.pdf?index=trueIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_a136477aa2534fe090bf687d01704363.pdf?index=trueIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/63398386028.pdfIn PDF document text
    • http://tikomiwewo.atwebpages.com/p90x3_workout_schedule.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_a047327e0e9743dcbbbb6c734bc79f68.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_b91459a16177474c866e4a4c5cd60c37.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_3f30d92a7f4e4c29a7777a23abaef5ba.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_baffc98a1f334df38a9a831de9484cb2.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_off0000ccce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCE 4912 bytes
SHA-256: ed9930ab9c8c4d1840bbe7f6c9b5a2c801d7eb754cd3907f2718c4275ae10449
font_01_sfnt_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 10028 bytes
SHA-256: 37e17076584970a9ba6fac6df24cf89ef7217aea1ee130550cedce87341cea44