Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d7122d85882251…

MALICIOUS

PDF

72.1 KB Created: 2021-09-14 10:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8755b0181466e9a3c575e0c37461f085 SHA-1: f7b96244b67fb437c0061736980378a79b001c9f SHA-256: 50d7122d858822515bde048791ba7e4c730b244056a63364639be9e1f153ccb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malicious content. The PDF structure and embedded content suggest an attempt to disguise malicious links within a seemingly legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://avs-market.ru/admin/ckfinder/userfiles/files/20825217025.pdf In PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/givikowogejolimikidata.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/satijabimotapogadaninota.pdfIn PDF document text
    • https://mahae.hu/files/files/puwazadejasoruxelufolirut.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/60331771020.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/damikovozojebugexukawi.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/jeroremu.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/18372649838.pdfIn PDF document text
    • http://stevis.cz/files/file/21466233313.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/fegagagalunidimidatu.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/xebimovadipiku.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/wabexulutomezaped.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/bolasofamotifelusokutuju.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///kumurawebatabuwu.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/kakikogazaxubadema.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/30141867988.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/8v0mntqp9j8r1aafac8ckhndbl/xofekitegajofe.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/73178485078.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/12163271357.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/68314018196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=providing+a+user+interfacePDF 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_off0000b912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB912 10772 bytes
SHA-256: 2a5b9ff39cd9c1b90e82dc8e778fd28ff1a0835cda1a2cc2235512823f801dc0
font_01_sfnt_off0000d1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 16348 bytes
SHA-256: 0559ed75fb62886aa7bb0657b08c6269c5cf4d68bdd62108cbd7775c48541929

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