Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b45a427673d67d0…

MALICIOUS

PDF

78.2 KB Created: 2020-12-26 16:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c2057b8eb86079e9481f2806c41ebc3 SHA-1: 7f8d95baf5346d7f703de852df8031d4d8cd0b81 SHA-256: 5b45a427673d67d05be9012f18aa15173bec20831313334ddba4f8f9bc6abff5
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 are dynamically generated, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/aws?utm_term=7075+aluminum+properties+pdf
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5fc159dfef0ca.pdf
    • https://cdn-cms.f-static.net/uploads/4368781/normal_5f89acc0bd585.pdf
    • https://cdn-cms.f-static.net/uploads/4407301/normal_5f99d746b0566.pdf
    • https://gigawixirebasig.weebly.com/uploads/1/3/1/8/131857482/dowuw.pdf
    • https://static.s123-cdn-static.com/uploads/4450517/normal_5fc71a9487987.pdf
    • https://getomipo.weebly.com/uploads/1/3/4/4/134403721/8061784.pdf
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/33e8d18249b7b93.pdf
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5fa0293d0a4c1.pdf
    • https://xakuwije.weebly.com/uploads/1/3/4/3/134340554/pevuko_vodunom_gizurimafe.pdf
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/warug-jikiwo-dakisikuf-nuluvetoma.pdf
    • https://cdn-cms.f-static.net/uploads/4447877/normal_5fdc8ef42d5c0.pdf
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/baziziroguvog-teronekox-lifuxi-najaloka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/medaliwifufugel/alphabet_flash_cards_printable.pdf
    • https://uploads.strikinglycdn.com/files/df6b08b1-77fc-4201-9c73-355f5bf015ea/tipinudolele.pdf
    • https://s3.amazonaws.com/zetare/82465873561.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e5.bin
2313a6d5fe28f01c67db7f2c9d6c1d8d67ee0ff8d2fb7f152f84040378a7245e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 5440 bytes
font_01_sfnt_off00010351.bin
8e5df7f5723e6e966e8ca775498d50e4f0791b2bfc6775dda80ea6f1ba8c3d78
pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 12160 bytes