Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0584a8104d2fa6…

MALICIOUS

PDF

73.9 KB Created: 2021-02-22 06:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0360e59c3b80bd14579b97cafdc959fc SHA-1: 22d9da3bbecf20d3adab899171d10cc5a561bbba SHA-256: 4b0584a8104d2fa6128271f4e7d4e61f7208a3eb3caa9ba81bca9d590fe5b030
226 Risk Score

Malware Insights

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

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate further compromise through credential theft or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://leonvi.ru/wix?keyword=walmart+everstart+battery+charger+manual+pdf PDF link annotation
    • https://vofovolovun.weebly.com/uploads/1/3/1/4/131483423/614638.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/8059e0d1.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/kowiwitopabotuk.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/gehauif/98063181701.pdfIn PDF document text
    • http://lnstagram-helping.live/the_secret_law_of_attraction_videonczb5.pdfIn PDF document text
    • https://cdn.sqhk.co/wisisatofife/hUnzGpG/fodubabilugolopazazo.pdfIn PDF document text
    • https://cdn.sqhk.co/kagawupatow/FShaPjg/197465472.pdfIn PDF document text
    • http://itverys.space/49629421838gszoj.pdfIn PDF document text
    • https://rikedinodewo.weebly.com/uploads/1/3/5/3/135323941/e8b27160.pdfIn PDF document text
    • https://vowexigap.weebly.com/uploads/1/3/1/6/131636774/lebafik_dokafubuvike.pdfIn PDF document text
    • http://store50off.info/xafonipofojuxea0yqu.pdfIn PDF document text
    • https://jeruxonoja.weebly.com/uploads/1/3/1/4/131407493/90f5b.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/haQOjcS/pencil_cactus_growing_tips.pdfIn PDF document text
    • http://samyog.ru/868755424942y1pu.pdfIn PDF document text
    • http://lovepositions.info/38873330318ii70x.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/fefurorobumi/expanding_binomials_worksheet_with_answers.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_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 5884 bytes
SHA-256: d252bc2ed811cabc8fcc650ce0606c487edc4610aea80458505304bd26e54ee7
font_01_sfnt_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 10892 bytes
SHA-256: 80e954226f3af006f2824e0e1db377c72a766a91bbb66a3328c078292ac20789

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