Malicious PDF — malware analysis report

Static analysis result for SHA-256 3daf3b84ba73de35…

MALICIOUS

PDF

72.8 KB Created: 2021-03-03 01:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1d02778e81668256388b92541193a936 SHA-1: 20d380839ee67e3924243a8f275927b356e4e5f5 SHA-256: 3daf3b84ba73de35e27944feb8b50965923997d9d63ebcda2e5c82ec56561f72
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://midufefew.ru/strik?utm_term=generac+gp3300+home+depot PDF link annotation
    • http://juvugewit.iblogger.org/blooming_garden_game.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/zipav_mugusuw_refitutudoweto.pdfIn PDF document text
    • http://nashremont.site/testout_security_pro_exam_answers5aept.pdfIn PDF document text
    • http://afracheat8.xyz/probability_for_dummiesg70ej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_603eb9c41c8a4.pdfIn PDF document text
    • http://hugertely.xyz/kopowutawilibukenqcy6.pdfIn PDF document text
    • http://seomagnat1.online/cirque_du_freak_2020ac3p4.pdfIn PDF document text
    • https://sufidubiziden.weebly.com/uploads/1/3/4/7/134732268/vuleki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fe2055f4ad8a.pdfIn PDF document text
    • http://3gusevshop.website/articles_of_incorporation_template_freek60z7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fe7f430a1caa.pdfIn PDF document text
    • http://lbaranaydin.com/lotaln3flg.pdfIn PDF document text
    • http://andyhong.blog/steel_tank_weight_calculator_excel8j0xl.pdfIn PDF document text
    • http://whalesqpa.fun/concept_map_template_blanka0nmg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_602d43524389c.pdfIn PDF document text
    • https://japugaze.weebly.com/uploads/1/3/5/2/135295186/7229796.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwiwomuve.rf.gd/45409834201.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/73323004626.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/72554817897.pdfIn 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_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 5616 bytes
SHA-256: 93f6c014f104cec5ae7b93c82d8e15b8e2194da301558b6e088ab6b5abdd504c
font_01_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 10580 bytes
SHA-256: 919fb05d41d46197e4d334993894069c69c98dfab7ea69674feb6c94087ac11b

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