Malicious PDF — malware analysis report

Static analysis result for SHA-256 5993d922480b21fa…

MALICIOUS

PDF

74.5 KB Created: 2021-05-18 23:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57688597b1388ae44c15046727fab8b3 SHA-1: 243d9fcfa14a8385cb8515908be59ef936cefa39 SHA-256: 5993d922480b21fafe7b471c96496a48ac2cd77fd22cbcd0086e8f0e1b6af8e6
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to an algorithmically generated URL, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, suggests a lure related to a 'grandfather clock manual'. The presence of multiple external URLs and a high ML classifier score indicate malicious intent. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=ridgeway+tempus+fugit+grandfather+clock+manual
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c03bd1d5b8---nipogejenesodilaziwuzi.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/db7absjb1pjqlokbgbs0i3dgm7/pifojekexawajegum.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac53b86a4---resixis.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff1b8e9859---xipagiwafaberenafogepo.pdf
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/basogefomidugomezeta.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728033ccbcc---jeworipiwok.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160794e219d150---55649809228.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bb04ae58e05dd8170b653bb6c7be6568/karejerokevifejibepogex.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5a95b9bf5468f1f43e0840555f3a5c83/zanutidirinezalelebadun.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f35c96cc572929f688295081891035c1/8446487434.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f4d84dd5db51b663e776cc67741ca272/28609066670.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609740aee2309---nizejo.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16084472661c6d---wememovezerufovono.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7242c5395---74011403021.pdf
    • http://sacoorhealth.pt/site/upload/file/gixibidelifewinutiga.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609933b1857ef---65752785712.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16086199b39b99---72970708643.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ee.bin
862ad80a90339070f85f0e1ee6c24ccc61c5a5706118d20825d2f47dd606337c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 5836 bytes
font_01_sfnt_off0000f7c4.bin
ee715f45b0be8db61b531280ddf2a0056335f971b1b41ff0be026be03c91abf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 10288 bytes

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