Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0b7ad1d394656d…

MALICIOUS

PDF

76.2 KB Created: 2020-11-10 06:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e99ac97eb3ffb64754cad074bd510d8 SHA-1: 1759f39136e3c758f54b1a1b3acea93270f37491 SHA-256: 5b0b7ad1d394656dbf069b4ef8d30d49c0aa94ceeaa318985df3b165fac9086e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful websites.

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://trafficel.ru/strik?keyword=black+panther+full+123+movies
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5f89a8b65ebc7.pdf
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5f9aa154db3dd.pdf
    • https://gewusepisegetu.weebly.com/uploads/1/3/4/4/134492884/4892d4908.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/efe324d83e9.pdf
    • https://gekilatati.weebly.com/uploads/1/3/4/3/134378061/653e63580e8d8a.pdf
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/27ea7b6f6e4b8.pdf
    • https://cdn-cms.f-static.net/uploads/4371240/normal_5f9ea185de3b7.pdf
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/deselexubuzan.pdf
    • https://nosuxiseliv.weebly.com/uploads/1/3/4/5/134578333/juxotubojenidiw.pdf
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f8e17b673ce9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6f0a1d37-fcd2-4f94-8899-c5a0aba45780/live_photo_porn.pdf
    • https://uploads.strikinglycdn.com/files/665cb3c5-ba8f-476e-a048-157d62d8aec5/dejawen.pdf
    • https://uploads.strikinglycdn.com/files/40bdc61c-b436-452d-92dd-3b64f2f1014a/minakuf.pdf
    • https://uploads.strikinglycdn.com/files/b1ad7e88-c642-4102-840a-a5081b549018/hitfilm_4_express_system_requirements.pdf
    • https://uploads.strikinglycdn.com/files/80a47f0a-35f0-4728-8774-285e319123c8/65567105372.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d517.bin
9ea14f5888d05a833a53a821736cbcb34b9f4cb3e2e3d6188f8023163a22e3a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 5776 bytes
font_01_sfnt_off0000e8aa.bin
7f8b7514c039d59849ab9f13a5d497bbb5e00f007d24a35f80f9ca3aa209f767		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 11236 bytes
font_02_sfnt_off00010edb.bin
378ba5569bb666bbcf62f6b10ce7b1b17e3ec70dff13df96b0486da8cd924b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 16064 bytes

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