Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7982b003643eee…

MALICIOUS

PDF

82.1 KB Created: 2021-01-06 13:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 83909f222cdab2f3a4fa594a24602fe9 SHA-1: 62a5148cc1ef628f2a5bc9869e3fe2ac627f790f SHA-256: 7e7982b003643eee7fe5efc460b4db589a988c77aa131462d02e91317726bdf7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or phishing attempt. The ML classifier and ClamAV both flagged this file as malicious, with ClamAV specifically identifying it as a phishing trojan. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://traffnew.ru/123?utm_term=how+to+show+layers+in+photoshop+mac PDF link annotation
    • https://gumakini.weebly.com/uploads/1/3/1/4/131414358/3802879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_5fd12fd425f55.pdfIn PDF document text
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/zogemuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5f8b7718e97b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5f90c5a29baa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5f988dc4c73df.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/d1b621b66.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/makumapikeze/reduwaviribebuw.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/90089185381.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/digosi.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_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 5328 bytes
SHA-256: ffb20ca235d629b6442676914c91b1b380907717b42ee3c98aade6069e08c090
font_01_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 11020 bytes
SHA-256: cfdb0befc8b108938dec99705f122952a765952b8c3c963e57369a40e5ee67bc

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