Malicious PDF — malware analysis report

Static analysis result for SHA-256 01254d4c4d051c5d…

MALICIOUS

PDF

75.7 KB Created: 2021-04-12 03:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a29e4d71fdd2c7760979e03d08b59b8 SHA-1: 08451ddf88526fed50ff3dc5443e12cf3d0343bd SHA-256: 01254d4c4d051c5df766c142dbe1696d20fa8c1c70aac596843a7c1ff9db523c
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a link farm and ML classification indicating maliciousness. The presence of numerous external links, including one to 'kuzutuzo.ru', suggests an attempt to redirect users to potentially harmful sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware distribution.

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/strik?utm_term=schumacher+sc-10030a+manual
    • https://cdn-cms.f-static.net/uploads/4418786/normal_60512990681dd.pdf
    • https://cdn.sqhk.co/fopajuxalaso/ihghrhd/baby_flashcards_for_toddlers_app.pdf
    • https://cdn-cms.f-static.net/uploads/4500910/normal_6063c00aed6a0.pdf
    • https://cdn.sqhk.co/tavaxikanabu/iggjwjh/84296343885.pdf
    • https://cdn-cms.f-static.net/uploads/4366358/normal_603623b8c1adf.pdf
    • https://cdn-cms.f-static.net/uploads/4492871/normal_603515b6356f4.pdf
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/f071d.pdf
    • https://cdn-cms.f-static.net/uploads/4386597/normal_6013e1a1f30b1.pdf
    • http://wubowobipevoto.mywebcommunity.org/car_lighting_system.pdf
    • http://jiwimejikigigu.mywebcommunity.org/weight_lifting_plan.pdf
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/vepoluxisuluf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xoferuzu/6_steps_in_the_continuum_of_cultural_competence_for_agencies.pdf
    • https://uploads.strikinglycdn.com/files/86874515-0866-4149-acd4-e34f55b9b554/gilatojunuxavoxaga.pdf
    • https://uploads.strikinglycdn.com/files/351dc147-c335-4f79-b8ae-bca20d9b0ea7/the_challenge_inferno_2_ep_3.pdf
    • https://s3.amazonaws.com/zedudo/what_is_a_slang_word_for_looking_good.pdf
    • https://uploads.strikinglycdn.com/files/d195ed56-5b02-40f5-907a-e177c3bcfdb2/why_i_want_a_wife_judy_brady_main_thesis.pdf
    • https://s3.amazonaws.com/xamibudasagas/bogujivojoz.pdf
    • https://s3.amazonaws.com/wipotegadodorek/xukopiborer.pdf
    • https://uploads.strikinglycdn.com/files/554e9996-5c19-4d97-927f-ca493609b9b2/79644965031.pdf
    • http://senawoxagijajo.onlinewebshop.net/66302769563.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_off0000e84a.bin
67de0cb3b7703b0701e35a9d12993b841fb3872e8b6c9e014ade15fa4ec1ceba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 5532 bytes
font_01_sfnt_off0000faef.bin
495dd4a0291ff50273c928d2f0a23e48bbc59cba17e1922cdcd9c8d9db12c191		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 11408 bytes

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