Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dca57e43afadce4…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 12:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 343af1f29c7031bba328baa6dbe8996f SHA-1: b9677b8adcb4b56be1ecbd8321ea63e4e55e4c2c SHA-256: 9dca57e43afadce42471665a6b0f3dcd899c46c3de3cf378795d7e86b51ddbe4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URIs that redirect to external sites, a common tactic for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting a high number of distinct hosts and UTM parameters, suggesting an attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=bunny+run+cool+math+games PDF link annotation
    • http://myucpb.com/userfiles/file/naguzetoxuxenut.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/89454256725.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/bezoxa.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/satufewumepawalena.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a27941995d56834f73316cce1ab6ef8b/2681397358.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/waxeruzenolijejezubijiduw.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/4332408451.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/10846353966.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/xolomofuvabavale.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/40573163357.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/gewemifokawa.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4a10db80---73490082049.pdfIn PDF document text
    • http://pasaru.com/upload/files/toguzo.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/34918396390.pdfIn PDF document text
    • http://wawa757.com/uploads/files/97838287547.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/mujopanoxodezifi.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/96249140034.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/gofifexaxobaporo.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/56116963169.pdfIn PDF document text
    • http://ergakiland.ru/files/files/sopirozununupuvo.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/16100390020.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/piwonilarisijuruguwinelor.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/mitibufoputidelo.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_off0000c229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC229 10852 bytes
SHA-256: 8da56d29165c64abcbb33b6423b4a48a4ca0c5480de62a938be86db7b4dc38ee
font_01_sfnt_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 16572 bytes
SHA-256: 226385864d621c26ed2791a448ef6c07595924a65373d5b4b644dc9825be8b92
font_02_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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