Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b25a606201c69b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 05:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c76fefb3051ea6b8087e19ea7d0a5564 SHA-1: 0a617d6db652492ba2bf55c93940175ebf3909b8 SHA-256: d6b25a606201c69bdeb587611f4e969a7db0d2c7c7bfb118820d6ea83dbaca9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable and used in a link farm configuration. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, suggesting a phishing or scam operation. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=bachelor+in+paradise+australia+season+3+online PDF link annotation
    • https://yocarbroker.com/upload/ckfinder/files/89647863120.pdfIn PDF document text
    • https://servauto.fr/img/user/file/23017158235.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/fuvixe.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/pewubosaluregod.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/23068944456.pdfIn PDF document text
    • http://armanetti.com/images/90235874352.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/68627928857.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/33954797705.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/libazezibu.pdfIn PDF document text
    • http://zatacorp.com/upload/files/35494629678.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/32759398592.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/68571462885.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/43911202995.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/widoxiluwuzumeruzagoz.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/52270685761.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/nurubizakitezi.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/55607293431.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/31480742102.pdfIn PDF document text
    • https://casaalu.com/luutru/files/mujafixanune.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d11084556d6788106f6fd200ccbe3245/fegujavagonibejonofami.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/11331083685.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_off0000d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DC 17680 bytes
SHA-256: 41ba5080f682564174ce8579114f4caf21edd5da200b2190f90aee6b840a08da
font_01_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 10936 bytes
SHA-256: a3365515e62da023d6c979409dc46dca7b063dabccfb6e56909928eee4108f4d
font_02_sfnt_off00011bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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