Malicious PDF — malware analysis report

Static analysis result for SHA-256 c906a6e66f105870…

MALICIOUS

PDF

70.6 KB Created: 2021-10-11 02:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 814cc454c26b82d547827192d7f96967 SHA-1: 3b55558472bdfe739777010771a4ad0b78e0da6f SHA-256: c906a6e66f10587009f2723b2a672b36c7cb20d8098778e9370087add6fd4d1d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=four+capacitors+of+equal+capacitance PDF link annotation
    • https://idealist.ro/userfiles/file/buderezopomifomebawifis.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/vatasovok.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/sowugotugunax.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/49129454041.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ce7deb6f222acb9ada782ed502cd99e2/38906298484.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/pomelosopilategetomoti.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/gowug.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/ditivasiluvezopamisivafag.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/8699246685.pdfIn PDF document text
    • http://unityproductions.com/upload/files/finomatikekomija.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/batogipi.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/gekararepi.pdfIn PDF document text
    • http://geasit.it/userfiles/files/71872305337.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/14600306379.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/vogimomob.pdfIn PDF document text
    • http://citlak.de/admin/UserFiles/file/13803100616.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/60606017184.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/93092795340.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/15925426805.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/kubusel.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/29929224743.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_off0000b393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA5 16032 bytes
SHA-256: 7142d5d78f2717e977a0c71496d5c11fce685126b47290065dd8823764049bee
font_02_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 10696 bytes
SHA-256: f87dda1f80a2f39d09fca098078b2e2539026636629501d4db0bf62498157d41

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