Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cc6fd47da595a0…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 04:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f4b49354d9ba6c24528b5a0c72198a03 SHA-1: 6552bda539100bcf10e5c12ca238769225b81491 SHA-256: 86cc6fd47da595a0414f940f138519b40b19e0069cfe16245101433c7a28f66c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are structured as downloadable files, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting, commonly used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=an+ancient+clue+is+nearby+shipwreck+cove PDF link annotation
    • http://exim5.hu/_user/file/samuwil.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fenojirujiziwugipugigu.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/jemulewuninunodowi.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/8486365014.pdfIn PDF document text
    • http://dogable.de/userfiles/file/61294036369.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/ganorijabuk.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/15d0de86043f7453f5c9c0c452e6bd2d/vuxelomewete.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/85607872111.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/55990229651.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109210805324494.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/luwatuzujowaresufabevon.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/43713781248.pdfIn PDF document text
    • https://reha.bg/content/upload/file/xogikedemumexat.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/kowapajewobupupejazonijo.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/33988972603.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/72691313731.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/32414911238.pdfIn PDF document text
    • https://anfauglir.com/images/file/siwuloxom.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/20274628465.pdfIn PDF document text
    • http://partiaweb.com/upload/files/moduwuxatigenilogibisagig.pdfIn PDF document text
    • https://biocoils.com/img/file/waxepixekoviduvododepux.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/sumodugexanobomakufemi.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/41221721273.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/85757538179.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/81047051904.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_off0000b32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32D 11048 bytes
SHA-256: 977229c3d8392ea6f9df88d7defe1c6ae7ff57997fba9f5a5d64962396654351
font_01_sfnt_off0000ccc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 15388 bytes
SHA-256: dd1bb54c44912db49b96225f087eaf0cafa8947ae3d6bb3d91448de921ceae13