Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c851355a451834…

MALICIOUS

PDF

69.6 KB Created: 2021-03-20 22:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3d4a84b25ce10b6351f5bf7b84f2962 SHA-1: 2a205ed4f337915687c34263a612bcedab0f41e7 SHA-256: b8c851355a451834be0bf0ecd6462366e0ed94dc9f3c6dfa065b9d94b669db7e
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of a 'Clipboard command execution lure' heuristic indicates the document likely instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. The numerous external links, many pointing to PDF files on Weebly and other hosting services, suggest a link farm or a method for distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://jacksth.ru/strik?utm_term=dell+precision+m6700+graphics+card
    • https://xevubevisebu.weebly.com/uploads/1/3/4/7/134754503/mukubefa.pdf
    • https://jaligudupu.weebly.com/uploads/1/3/5/3/135391073/9652363.pdf
    • https://mosezogojufotu.weebly.com/uploads/1/3/0/8/130813841/5513329.pdf
    • https://static.s123-cdn-static.com/uploads/4412160/normal_600724ea5b6fb.pdf
    • https://cdn.sqhk.co/givogaduta/h8hdhjm/invaluable_synonym_list.pdf
    • https://cdn.sqhk.co/ruxuzobisu/umYugfm/autonation_ford_gulf_freeway_service_center.pdf
    • https://cdn.sqhk.co/perikowep/3U1DghR/rudozunixevojegogumikovob.pdf
    • https://cdn.sqhk.co/nedivixozu/fjduBJ3/95767911075.pdf
    • https://cdn.sqhk.co/kozutani/cgijjdD/cabinet_making.pdf
    • https://wonozonozosog.weebly.com/uploads/1/3/1/3/131398184/3585259.pdf
    • https://cdn.sqhk.co/susiwebuvowo/iebonOy/niselifunufux.pdf
    • https://sikefenuvip.weebly.com/uploads/1/3/4/0/134012601/6d77e8781.pdf
    • https://cdn.sqhk.co/vuzowadijavu/dwRKPzT/49700533001.pdf
    • https://cdn-cms.f-static.net/uploads/4464710/normal_602ae2d536aef.pdf
    • https://xudepafuvinuk.weebly.com/uploads/1/3/0/9/130969511/jijulixo.pdf
    • https://merasata.weebly.com/uploads/1/3/1/3/131378960/c9b35da4be.pdf
    • https://cdn.sqhk.co/nogawevorus/JGmhanG/76304710694.pdf
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/795292.pdf
    • https://cdn.sqhk.co/zebenane/igeijgi/ikea_black_friday_2018_espana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rizijubovapuk/national_geographic_history_magazine.pdf
    • https://s3.amazonaws.com/remavuj/tefanumalit.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_off0000cf4c.bin
00911efc0423d8adf141d1fcf5741fe454304da56e68f0f7af1e7044f51cbe4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4C 5860 bytes
font_01_sfnt_off0000e31d.bin
de5d2974f46e2f91cf8efee71fb66ba9486d1a872c287d900cdaaf889fd33769		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 11144 bytes

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