Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ee11b8a985e415…

MALICIOUS

PDF

81.3 KB Created: 2021-10-07 18:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3deb5cb9bc464ee6402451570d9940d5 SHA-1: 90071f709a9b8277c348ccaaa0bed0e5857e093e SHA-256: 42ee11b8a985e4156aa2f102929e9f6a5e3bfc996bdd331c8be784e64e8b33ce
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to malicious sites. The presence of embedded JS points to the T1059.007 (JavaScript) technique, and the overall nature of a malicious document delivered via attachment aligns with T1566.001 (Spearphishing Attachment).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=land+law+lecture+notes PDF link annotation
    • https://reaga.net/js/ckfinder/userfiles/files/zuzigimuk.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/zodologunasujo.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/33079241574.pdfIn PDF document text
    • http://vkts.se/userfiles/file/geseminokadanivik.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/23158711552.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/3872623905.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/69102535007.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/97587772938.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/xikonitetewiroroboboza.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/teworemojedopumubesekeved.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/60749782520.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/retotivuned.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/bosit.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/pejagidi.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/gobawatukebinujaroliz.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/43030911216.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/bujuko.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/vibobawagudoxukefusi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140abe4c2464---35688666804.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/40799241008.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161420b3f857ed---zizutizajivatajukabos.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/4942371177.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/sagav.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/luzaz.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/90220468927.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/zekisisekuw.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_off0000da2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 17508 bytes
SHA-256: 3ba88487fd7f9cf2e236a2cdc7bceb9df3a5da647c252ae6fff33d74e4512247
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 10412 bytes
SHA-256: 520dab9dd3bb19417177eb4935216ab5d2b8f405deb058aa7425b63c554f7974