Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9c2cab92eac536…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 02:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c97b75153763b422b9200f397bebe9f9 SHA-1: bcdbbff044a0c10a23f63778dee2df136ef0a802 SHA-256: 9b9c2cab92eac536be251f2fba614988a0e574a234fd2af7d3992a0385a5379a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, and is flagged as a link farm. This suggests a phishing or SEO manipulation tactic, aiming to redirect users to a network of sites. No scripts were extracted, but the PDF structure and embedded URIs are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://df-foundry.net/d/files/pasiveziranakoxiresevomu.pdf In PDF document text
    • https://farmacieitaliane.com/documenti/file/73579161659.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/tipanodasoxexinizaxi.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/6193342716.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/wixokiwisepesowelakede.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/jumelulobep.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/javitebogusure.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/dotezefaxatopojopejereje.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/wawuzizit.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/zowurobunex.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab313ea0f---30658641161.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/gelivipavow.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/suligekixiruvilawituwe.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/worapogavuluz.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/sazefewusegubamewinojim.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/kogetefopawenolijoro.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/valijisobiri.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/pakobifesidirojufa.pdfIn PDF document text
    • https://scalper.ir/data/files/file/83478419338.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/175e3b9f86faf018f9556ad3354aa939/30601874721.pdfIn PDF document text
    • https://maviet.vn/upload/files/66750246080.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/70023560010.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/fivaverasarug.pdfIn PDF document text
    • http://totoumi.jp/upload/file/zamujebafulen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+pdf+means+in+computerPDF link annotation
    • 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_off0000cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 10932 bytes
SHA-256: f39d4d5ae19bc4b48835d55615c71aff4d5c1b869cda4aedb331b772e39f26b0
font_02_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 17452 bytes
SHA-256: d89fc0a567d683a442719d04391cf1f94c7d2b4ff808a0bc843134e6082ee61c

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