Malicious PDF — malware analysis report

Static analysis result for SHA-256 444f3853ef1a8681…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 14:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 359d2927034be169f5222af4c497456c SHA-1: 4ca4f11e00093ac598ec2a7571e459cb09ed9a14 SHA-256: 444f3853ef1a8681d6fbc2d8682839ceb994d27d2c6e0ccf50b5b47527cc8681
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting an attempt to redirect users to malicious or phishing sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination through multiple redirects and link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=the+red+thread+full+movie+online+free PDF link annotation
    • http://burchiellati.com/file_fck/file/sagaratulefumewalewa.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/bajosas.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/42683321433.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/xuvematu.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/kilapuxejebewiluwitosom.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/25068935002.pdfIn PDF document text
    • http://webbuilders.com/files/file/gakezuwurijofojika.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/bukifofolox.pdfIn PDF document text
    • https://simorgh.it/uploads/file/27027863257.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a149656e---62136653120.pdfIn PDF document text
    • https://hgb.se/filer/file/towowa.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/11051921606.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/jemonajitoranoxoz.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/gejiberofiwix.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/30906829778.pdfIn PDF document text
    • http://robedecreateur.com/img/files/90629462797.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/21039350657.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/badufitutitiri.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tekavupirezabikorimir.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/enrjmrhg8dkegocf4gj0mdu4f5/lebadijamiwuzuvepozowo.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/tuwonuxudivasuziripulafi.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/57221625470.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/78087100087.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_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 10580 bytes
SHA-256: a8ce86b87818ed9fce2335951f75ce54e6bdcfce99fb2c485428d8a98da1830b
font_02_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 17272 bytes
SHA-256: 6b62c6bc13a7a199a3ed429abc3d8bf351dfb6abe25c8e49c62d093252bdd01e

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