Malicious PDF — malware analysis report

Static analysis result for SHA-256 856c4d525a9cd42f…

MALICIOUS

PDF

76.0 KB Created: 2021-02-28 13:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d8e67ad560e1ea48c47f531cb3f4b163 SHA-1: b13bd7ed680691f6a743b6434a8242e0e1c7796f SHA-256: 856c4d525a9cd42f0e85b3dfb1e9327bf8c28984a76c944ec3681f5940f2e9c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to SEO-optimized PDF hosting sites, suggesting a link farm or phishing campaign. The primary URL, 'https://xajibur.ru/strik?utm_term=how+much+is+a+transmission+for+a+2000+honda+odyssey', appears to be a lure for users searching for car repair information. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xajibur.ru/strik?utm_term=how+much+is+a+transmission+for+a+2000+honda+odyssey PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453337/normal_601dbbcbc7d0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_5fe91c79c021b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461791/normal_5fc7b466e4ab1.pdfIn PDF document text
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/1150200.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/66776ae33b2570e.pdfIn PDF document text
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/afd4a2c7b82d30.pdfIn PDF document text
    • http://arm-watch3.club/pevoxcmupf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5fe600fd96679.pdfIn PDF document text
    • https://nijolajosota.weebly.com/uploads/1/3/4/6/134678148/951505.pdfIn PDF document text
    • https://bebefezagogu.weebly.com/uploads/1/3/4/3/134372182/3810979.pdfIn PDF document text
    • http://online-bestshop.xyz/vanunefibefosixuwoxazopptp51.pdfIn PDF document text
    • http://lalashoppen.online/jigsaw_puzzle_template_16_pieces9cyo2.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/meludav/94539900606.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/androidgamer._org_gta_5.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/arithmetic_sequence_algebra_2_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/60089768694.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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 5660 bytes
SHA-256: 057fe81538f7f89a79e11a44aad27a29f6da96bc0b7f0db99c6bed0704fb8f9d
font_01_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 10760 bytes
SHA-256: 792735553e857b5b63cac6381a855149ff5b7dce2be2d2ddb3db48179eb56577

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