Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de651ef2aa0c86c…

MALICIOUS

PDF

68.2 KB Created: 2021-10-03 10:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb6f61550b288c15c4f7a4254b61d9b0 SHA-1: 8a1d8661c5555c624a12b55fd82db4c4efae38f4 SHA-256: 0de651ef2aa0c86c3cbcaa7395b0323cefceba9a64c31440def82ca1d35235c8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, typical of phishing attacks. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 68 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 http://world-green-hope.com/uploads/files/pixovufokegavijokukivid.pdf In PDF document text
    • http://gkz-crimea.ru/userfiles/file/vipamoxevesuti.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109092218291775.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/72240210761.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/4227692093.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/34348736613.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/87944327559.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/42941681533.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/26688625563.pdfIn PDF document text
    • http://herve-coiffure.ci/files/wagefazilugigomagija.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/2580961567.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/sutusaxeguxopo.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/63049127043.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210901_071814.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/80925066044.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/52758864493.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615575c3dd062---dowujez.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/xoradizixugodadogefive.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161584f383d429---jekawaxutekokidot.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/tujazik.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/99028145591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=marvel+puzzle+quest+character+guidePDF link annotation
    • 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_off0000ad9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9F 13840 bytes
SHA-256: 343b80fd7b1447042ab1fe3039080648d9a4229cdbddbf48bb2226d49dd6e97d
font_01_sfnt_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 10932 bytes
SHA-256: 915430de4a787d7341b4f6681107518e4a1e338ba83540b1c618a2cc2978a464
font_02_sfnt_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1