Malicious PDF — malware analysis report

Static analysis result for SHA-256 8632e189b7b3b3bb…

MALICIOUS

PDF

73.4 KB Created: 2021-01-15 04:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bbf6e1146f09968b88e7bec850f2fdd7 SHA-1: 9d513890eca1b82b4fec18c3091a154114679ac1 SHA-256: 8632e189b7b3b3bb8275d46ad363a4540b4c5cedc424b07a1f7beef8ea2cc95c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, suggesting a phishing or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. No scripts were extracted, but the presence of numerous external URLs indicates a potential for downloading further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=stay+sam+smith+piano+sheet+music PDF link annotation
    • https://cdn.sqhk.co/pevedapev/dVO7ggT/unity_3d_endless_runner_game_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_5fab9fa983f4d.pdfIn PDF document text
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/gugugetefup-vubupalon-waweve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485152/normal_5ff51aea0cca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_5fd67d1d5483f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421764/normal_5fc969c229e80.pdfIn PDF document text
    • https://site-1167961.mozfiles.com/files/1167961/top_10_best_adventure_games_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_5f9199ef2bc72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5fc86856e4147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_5fb7f702b51a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fa61affb34f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450259/normal_5ff225aa080da.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/bjgbgc7/polewisiwisebenifemun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF5 5132 bytes
SHA-256: 6757c622727e56f38d85a0c77c3b1d6e5e30c240036a6b1a7292d42d32974068
font_01_sfnt_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 12640 bytes
SHA-256: b61d10d418b0c21156d37694af9f0f9fa68a71aeacf437571a5e5c3ad8efd962
font_02_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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