Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ca45c9a9eaba99…

MALICIOUS

PDF

84.7 KB Created: 2021-10-08 06:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eccf417d5fd47d691ea0c550b9d7f073 SHA-1: 764deeb282f95f6eb5dd7c56de3607c8dfadfb92 SHA-256: e6ca45c9a9eaba99ee7f87e34b77a891232b1a26c8140a5a2f6f88919d3d255e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs, many pointing to disposable domains, indicate a phishing or link-farming campaign. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=reined+cow+horse PDF link annotation
    • https://vibangnhadat.com/uploads/files/16041205481.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/vokegodobijekinejo.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/gukometujamexug.pdfIn PDF document text
    • http://sb-78.ru/files/file/65333930749.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/68522374545.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/30636888479.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/10070456483.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/36891311787.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/xevisilemavifomofenenemat.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/97853547003.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/91364353139.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/vewopowotovagapexexifozaf.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/1544233956.pdfIn PDF document text
    • http://minerva-collection.net/files/files/fenusulo.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/bibolater.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/21012909542.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/lazibifukimimijevafitup.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/71359682289.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/fizewutusijofuxeletil.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/51162357456.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/15660545433.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/3007487474.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_off0000e36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 19392 bytes
SHA-256: d8214a4f0ca57b4535a2f1faeee68c8480bf06bc28ffda96327188618783a32b
font_01_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E66 10292 bytes
SHA-256: 604524971d9da4247134d4a98ebbea117f9bda1cb518a44fb43f2275b81d11b1

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