Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3e742eee20efa3…

MALICIOUS

PDF

95.8 KB Created: 2021-03-31 05:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bb26e3b12e33839e393a8de4e4cb4c38 SHA-1: d1d81508b3edd5c9292f037c816d8d764e64ac9e SHA-256: 2d3e742eee20efa3b30c03275eae68941dbc0191e446d601b703fcf7fbdf493d
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a redirector, suggesting it's part of a link farm designed to lead users to potentially harmful content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=basc-2+score+interpretation PDF link annotation
    • http://bakofutemuxasog.iblogger.org/fusionner_2_avec_acrobat_reader.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462714/normal_5feb94bedb880.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/gugubudifupit.pdfIn PDF document text
    • https://xajekegok.weebly.com/uploads/1/3/3/9/133997321/wevevebovedisap.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/bulezijiwowi.pdfIn PDF document text
    • http://pifafuvutote.iblogger.org/azure_storage_explorer_old_version.pdfIn PDF document text
    • http://new-leggins.site/505120499832jfeq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_60605a06efebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_602559596d38e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410418/normal_5fcf483094bab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389085/normal_5ff34cd4b7326.pdfIn PDF document text
    • https://gupexududoteg.weebly.com/uploads/1/3/5/3/135302954/serop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vowukuzu.rf.gd/mowetasonofigevotalopot.pdfIn PDF document text
    • http://nuwumunis.epizy.com/abstract_algebra_an_introduction_hungerford_3rd_edition.pdfIn PDF document text
    • http://nimimetebevazi.rf.gd/administrao_financeira_e_oramentria_2020.pdfIn PDF document text
    • http://rimaxuj.rf.gd/dowuboralutusefiweze.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/exercises_reported_speech_with_key.pdfIn PDF document text
    • http://netifikapiwi.epizy.com/xudikewekupij.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/59321080457.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_off00013643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13643 5108 bytes
SHA-256: d92048f7ee9993f3d9b9373dda4a3fafc5a9f080cf09da7baa5995e11b09204f
font_01_sfnt_off000147bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BF 12656 bytes
SHA-256: e0d11f432725c58b55ed706af6ea9bc9f4fdff24495a9ef854140ec699037f6f

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