Malicious PDF — malware analysis report

Static analysis result for SHA-256 138c98bedbb730d1…

MALICIOUS

PDF

73.4 KB Created: 2020-12-02 08:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8aa7e1f6123b0acec62f33e29059110a SHA-1: 3bcf42d5a7ffeddb76e3ed091cfc1810964dcc04 SHA-256: 138c98bedbb730d127cd06fb167fe1388ddce4449b7f3a867b83b2c39b442ec2
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'traffmen.ru'. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it may be part of a link farm or SEO poisoning campaign designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=french+b1+vocabulary+list+pdf In PDF document text
    • https://dimitosakusefix.weebly.com/uploads/1/3/4/6/134631941/1253ec88f.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/gibozuginovak-josorad.pdfIn PDF document text
    • https://nalatuzub.weebly.com/uploads/1/3/4/3/134324595/makis-wenirexixegexa-mijatukabunax-posekafo.pdfIn PDF document text
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/4420929.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/62098683760.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4dbfeaf37e3b64923071/1606372800298/unblocked_mario_games.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/muwesisulalipuvuz.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/nazidonikajuwidupotox.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/tecnologia_da_informao_nota_de_corte_sisu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe40b9bc819f1cf4a4991b/1606303929818/rebujagaribum.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc378c5085bf90c0e0d73db/t/5fc4386a9d7936484013fc58/1606695019405/keurig_k500_plus_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/dejulesosibexejagepe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe012e537a05ef0995e2/t/5fc20b09e18c5c478e42ccb2/1606552330263/jupas.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/27602198907.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_off0000d733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 5552 bytes
SHA-256: 5f99ab583216c39c8757e88e5601768fe50eda18265164c535b91bc4e8d332a9
font_01_sfnt_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 15720 bytes
SHA-256: bcc7025df5d8f397758a4ec04ecdbef50146c3d68ceb666575e97153216e0850

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