Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9587237cb8b25c6…

MALICIOUS

PDF

69.0 KB Created: 2021-05-06 22:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c6c54de60d00bc9ba9470b4051383a6c SHA-1: 18598ade38243dc61944662b26fd8130c6bbcca8 SHA-256: b9587237cb8b25c61beeb6cd79da7c4245076797723ed03b205ca47413d00972
186 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the document's deceptive title point towards a phishing attempt to trick users into downloading further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/strik?utm_term=bose+universal+remote+device+codes+book+download PDF link annotation
    • https://kofijowuz.weebly.com/uploads/1/3/4/4/134446653/ccbeb7.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/download_biodata_format_for_job_application.pdfIn PDF document text
    • http://zuwifipenabed.medianewsonline.com/7871226401.pdfIn PDF document text
    • http://lutefadeba.scienceontheweb.net/audiosource_amp_100.pdfIn PDF document text
    • https://rixafivi.weebly.com/uploads/1/3/1/3/131380000/24c4d96309.pdfIn PDF document text
    • http://pojibuvuj.mygamesonline.org/46131315036.pdfIn PDF document text
    • https://lisobigu.weebly.com/uploads/1/3/1/6/131606175/wuvopimojimujebali.pdfIn PDF document text
    • http://tiktokhd.design/slice_of_life_animer1amh.pdfIn PDF document text
    • http://byt-upak.ru/zugamumegigutupuwaxoxetuk7n0j.pdfIn PDF document text
    • https://pakimisubimoge.weebly.com/uploads/1/3/0/7/130776027/764b9490.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekejuf.atwebpages.com/29235219977.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_88b691abb82c4a178c6823fe070d53e6.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_3490b9f660fe4b09a0d0b06bae94ed79.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_dcb9e466dd284932b7c9d22383fdedf4.pdf?index=trueIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_5b4c45bc95814547aa726ed4ac0672c5.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_eee1831658bc433a9289412465820218.pdf?index=trueIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_7d79ff06bff848b39ff1eb952d9c9f46.pdf?index=trueIn 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_off0000cfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD6 5488 bytes
SHA-256: 60f6573531a957bdb0fa0c9c4a324c99dc974f3ed915ba60d25baa2053417254
font_01_sfnt_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 10584 bytes
SHA-256: 5f5418345f343bb640083868c51c5204dd1a3516d49198c7653aa3118b17cb2c

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