Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73a074b493c53d2…

MALICIOUS

PDF

75.9 KB Created: 2020-11-29 20:35:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8fdbb6c330730c73e2699f9716ac91ef SHA-1: d5576f2bcfd42f707c70c77d379b4236726b2fc4 SHA-256: b73a074b493c53d26447ad5af347a3fe766345717b973b6fa7ae74f5fb3e9d33
214 Risk Score

Malware Insights

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

The PDF contains multiple links, with one specifically identified as a malicious redirector pointing to 'traffking.ru'. Another heuristic indicates a PDF link farm with numerous external PDF links, suggesting a phishing or SEO abuse campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • 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://traffking.ru/123?utm_term=between+one+and+many+7th+edition+pdf+download In PDF document text
    • https://roxejane.weebly.com/uploads/1/3/4/4/134486752/dejoligaxuwizoj.pdfIn PDF document text
    • https://warisizapot.weebly.com/uploads/1/3/4/8/134871943/fopafalomoveji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5fbf839941119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_5fbb5bf5aa0c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_5fb3d1cf954c3.pdfIn PDF document text
    • https://wazajodowefode.weebly.com/uploads/1/3/4/0/134017502/8149106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5fa3af92b8373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f8b412a4a1e1.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/3d21f99.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/sugowubuf/3rd_kalma.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/syntactic_ambiguity.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_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 5332 bytes
SHA-256: f58bdc6b54b6730873c78c9e76770bd4793b4b3ec64086d42c349dd8e73545e0
font_01_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 10888 bytes
SHA-256: 14268c4cd6d16bacbd86cdc6ec35c214e9736403dae9751cff6b9c731f6fa81b

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