Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0ffc5d791709a1…

MALICIOUS

PDF

90.9 KB Created: 2021-04-01 18:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 58d32bd1def46c96c537dacd0099e256 SHA-1: f5238577508d49ecb863402c2dcb1b38e635a82e SHA-256: 5a0ffc5d791709a1088ea660179ae16fcdff1ef3524c4195763e69ce89d243bc
226 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a shell, a common technique to bypass security measures and download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • 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
  • 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://fokemale.ru/strik?utm_term=brother+mfc-7360n+network+user+guide PDF link annotation
    • https://cdn.sqhk.co/virapazetif/bamVQre/cartoon_defense_5_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/fusojafiza/ghOgfid/gapejexozipatu.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/Ggjggja/clumsy_ninja_x_kira.pdfIn PDF document text
    • https://cdn.sqhk.co/takabalal/djc5gjD/regenuwuv.pdfIn PDF document text
    • https://cdn.sqhk.co/gemesikexo/ghePhfC/57883723338.pdfIn PDF document text
    • http://kotodagojaf.iblogger.org/zuparugixonigotufe.pdfIn PDF document text
    • http://nefetenebubuwid.iblogger.org/proceso_de_investigacion_cuantitativa_segun_autores.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/TjenAjg/jagusi.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenares.myartsonline.com/78617757321.pdfIn PDF document text
    • http://tunijerizimajej.epizy.com/how_to_program_a_new_directv_rc66rx_remote.pdfIn PDF document text
    • http://wupogegefug.epizy.com/agile_principles.pdfIn PDF document text
    • https://8084a2ae-6cfb-493d-8155-0d4219c0f7e3.filesusr.com/ugd/5b3528_d99f8ca6268f4a39aa4286a7b2ad1d05.pdf?index=trueIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_4bba24846e2843c08861918f3e02b085.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_6e54b2c34c844970b4de0a45f621e799.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/anonytun_vpn_version_1._3.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/pejovu.pdfIn PDF document text
    • http://pamapubosozule.epizy.com/94189523507.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/68154450922.pdfIn PDF document text
    • http://tisavan.onlinewebshop.net/31130465441.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_2ec0e4e10f1941cdad15ad02b158832a.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_a93d6067ddbb4cf18c7e6a038b446a71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/pexoxejil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 1724 bytes
SHA-256: a931ff3fa825443b93b369ae2d426ea300e579fad8992fa37b98769a4031c84f
font_01_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 5968 bytes
SHA-256: db3c947ce488ae6eee472d0762dab8471664d861b60b5dddaf88dbf3f323fb9b
font_02_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 11968 bytes
SHA-256: ff9e8c2d79a65a9933556c30765a81cd130df914a410ae2da067c840e74678c2

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