Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecf336492eb596b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-25 20:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5bf91ef405eac7e7d204d3bb56be9136 SHA-1: 6c92e6066991a18d1da7b390ad3524797fe73a36 SHA-256: cecf336492eb596b410c98f59100849d379f6e1d27651b9fa13977bf88ba5775
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including a screenshot image and embedded links to external websites. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and appears to be a byproduct of the wkhtmltopdf tool, offering no direct textual clues to the user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 76 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=one+piece+dubbed+streaming PDF link annotation
    • http://boilerservis.ru/uploads/files/83221195356.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/56363568511.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/dubuzenegoxegisibedofe.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/poxuvurudekebo.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/39767884479.pdfIn PDF document text
    • http://rapet.hu/files/wekonegomukelobugaxib.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/lusalogalilezudi.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/puseburamejowuvofa.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/fovezamavopelowokulid.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/86103316191.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aee2740ac---28424113241.pdfIn PDF document text
    • https://greenways.at/userfiles/file/bezejebov.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/basiruj.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/72526715269.pdfIn PDF document text
    • http://airfa.it/userfiles/file/62103721932.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/gegaboxedibasefelutep.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/72507661028.pdfIn PDF document text
    • http://carszana.com/image/upload/File/44677444559.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/6784503488.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/xomunodefiduxajitisa.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/13566326056.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/85178826597.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/datirerutiluvu.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/30939134599.pdfIn PDF document text
    • http://badgerhillfarm.uk/40156116854.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/vusebefere.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/lelowib.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D4 10956 bytes
SHA-256: 16961faeb612ac2a06a8902d07f0b8a25e1d9abadc09c25323321d95bb764c3c
font_01_sfnt_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 18736 bytes
SHA-256: 7b3381b8fd9c651ad0b8f93e74726c2e0f312ff189bc0f09321f1dd29cb97011
font_03_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 14256 bytes
SHA-256: 4366525e225fcc5a3e68d1277ab36a1f07cb0a614540d97486c300a811b2a872