Malicious PDF — malware analysis report

Static analysis result for SHA-256 0441b22bd1bf4743…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 21:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9fe2edc626633fc6b6ba9a8de1704a9e SHA-1: 2d7c35f561b15bc206c156c13d0f393b42da2969 SHA-256: 0441b22bd1bf47432b58c4c3eb5ab57dabd2deca972794276f026763689bdb14
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to redirect users to malicious content or phishing sites. The document's structure and embedded links indicate it is part of a campaign to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=snake+eyes+original PDF link annotation
    • http://kolesnikov.pro/ckfinder/userfiles/files/4521052336.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/nibuniwagolofodifimalos.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/38492491025.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/27451031390.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/sepegepofosabef.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffd2f22974---betiselusiwumutefegutemat.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/26256308480.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/38641901153.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/paxunikut.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/49869388286.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/dusigatevesivuxovobo.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/biwemegazedepabunavuremi.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/96851035448.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/mevodekevupawik.pdfIn PDF document text
    • https://afma.pt/site/upload/file/88860298983.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/41961972256.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/fugunedova.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/wafusufasok.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/laxaruzivukererifip.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/17393172146.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/lewudamotaxakavisibi.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/99305578780.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_off0000b826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD038 17228 bytes
SHA-256: c91bd8d6ee40dacdbe76f6a3a2072cb2324394470262a8573482f3473bf25482
font_02_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 10468 bytes
SHA-256: 4732cb246d3d42688aac885c799ad3e096069c004d863dd0fa537d75a444af47

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