Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fda97634f87021f…

MALICIOUS

PDF

97.2 KB Created: 2021-09-21 06:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2e0e02c66f2c3c14fb060330a40dd1d3 SHA-1: a82b28045ba7d8ea57597eeaf8d473e497c4accf SHA-256: 8fda97634f87021f5956028b805ed05daad088ae35fea59b6c53a00537ef441b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, one of which is hosted on disposable infrastructure. While no scripts were explicitly extracted, the nature of PDF-based link farms often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://felixtrail.com/imagini_ws/36509993750.pdf In PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-17/20210917202453381520.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/80581319612.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/tusulamazibuzejekesatuzu.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/73674733321.pdfIn PDF document text
    • https://stvorki.ru/files/file/75597276036.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/desotafofegofe.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/kobawefadaresageline.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/39213441261.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/54548037264.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/xajuziregapi.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/15742444853.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4d2e4bdc26bba601a76ed5575b987d0c/menemunewituvevirenipimi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9721110a---lavoti.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/41087490901.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/35706662986.pdfIn PDF document text
    • https://dptech.vn/uploads/files/panuralimudurib.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/wakavijudizeka.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/momoxo.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/loregoda.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/morawekelisetinozegi.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/rebidanuzupubolew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=death+guard+codex+9th+edition+pdfPDF 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_off0001140d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 11056 bytes
SHA-256: a8bde8e4511c67cf4487ef969d204e6607676ece93e4687563cad93d6b85605e
font_02_sfnt_off000145ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AC 18708 bytes
SHA-256: 5eeb4c9dacaa30f9e82050b5b920fac68b6f90878cc53e7af4e9bee6f9f29585

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