Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b7a8c468334c34…

MALICIOUS

PDF

68.4 KB Created: 2021-09-11 08:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06e4419a93e7fe9eb77eb28d9d933853 SHA-1: d077d9f90d50aac45b54d38a22df3e205d4189d6 SHA-256: b7b7a8c468334c346b9d1e284ba65f6894bfbb75e8b5c308d9fa584ffccfee66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, and the ML classifier and ClamAV detection confirm its malicious nature. The presence of embedded URLs suggests an attempt to redirect the user to malicious content or downloads, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 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://pistant.ru/uplcv?utm_term=gta+san+andreas+free+mac PDF link annotation
    • https://worldpigment.com/image/upload/File/61521849651.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/76023036014.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/13645634230.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109061325084147.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a598c787---62634443197.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/66212831618.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210906/210906202210112965r0z456h6j20z.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/67495943314.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/xavixofigu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b367d615d155abe9dddd58de24a5a87b/43698590368.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/puzagifumezuf.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/14768473815.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/22148739573.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210901_145106.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210905041054182.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/82382714722.pdfIn PDF document text
    • http://telecycling.org/files/file/72007571043.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/wodalekodevez.pdfIn PDF document text
    • http://contextuae.com/resimler/files/19071509336.pdfIn PDF document text
    • https://membermimpi.com/contents/files/90159142592.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/pazapazijudebova.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/segaf.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/46953974688.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///savekawulatov.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/xikulixo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB106 14372 bytes
SHA-256: 7832d4274e9bf228316647234ef87433e01157cf99acdfa0dfa622f7e3ae785f
font_01_sfnt_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 10416 bytes
SHA-256: 31905fa99f4c4957bbf20898189f723e15ee195f79a3a60365d00d517f8d63fe

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