Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9af74585375c63…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 09:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e08616df77fb606537076fde0ba1e83 SHA-1: 6bc8e342974c37112bd7c84e711cdea8bce61ec1 SHA-256: 1d9af74585375c633a454c0fac2128e7afba7c04bdc3a26a3b470a7567fb2aa3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/uplcv?utm_term=games+like+osu+for+android PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c295bccfe2---31758620951.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/74364472631.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/sewetepuwekidakezedesu.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/52407861059.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/20582594963.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/ponuturuvisevep.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/namedebiguw.pdfIn PDF document text
    • http://espokebar.com/uploads/files/89061433659.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/15352503016.pdfIn PDF document text
    • http://fedime.org/imagenes/jujodom.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/8361414969.pdfIn PDF document text
    • https://harmony.im/userfiles/file/92051255851.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613304a99e26c---20767464177.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/jeporewide.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/87050002967.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/73712250106.pdfIn PDF document text
    • http://suurelepa.ee/data/file/25570577799.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/95166622673.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/kanedusibaf.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/mubowotolasogejujisiwixat.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/satanufekawegowovebawisu.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/816409139.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_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 16820 bytes
SHA-256: b62e0ffe1071a04183376939163e74382f39608877dd70bd31ee22b2b9b14d3d
font_01_sfnt_off00010c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 10648 bytes
SHA-256: 60184812876737b25672669c009e4cfd7e430b74e499bb8f3cc5c42d2af7efac
font_02_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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