Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8aa282780c2a5d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 02:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b98398b63f8af45ab9e5beee0c0d2755 SHA-1: 296debc1a2f4bb9c51f3df672bacbbecbf8d982a SHA-256: 6d8aa282780c2a5d60b178ead6d0130f2ab76309105e759a8626f64ac256ce41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to unknown or potentially malicious domains, suggesting an attempt to lure users to phishing or malware-hosting sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://insolite.lu/img/userfiles/files/dijuwopuxododaditix.pdf In PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/1512497523.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/23556100988.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/57591408735.pdfIn PDF document text
    • http://qdjshg.com/files/file/safenavesugemerezorizosuf.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/wikugevob.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/bifofo.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///loguzexulesufawal.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/28644103319.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/67607623317.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/fubasuduvojoxogaruf.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/64390140705.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/60304945470.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/kajafigo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca90b71cb---64690409585.pdfIn PDF document text
    • https://oasis-travel.ro/files/59758410443.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/xinazivofolezuge.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///1465224413.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446729ee44c---minalagukapidutugeragideg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=partage+de+connexion+pc+windows+7+vers+androidPDF 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_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 19720 bytes
SHA-256: aa8574a5c861512842ea3b5758f36714fa39e021606dfb4af86e75fe3fd7e610
font_01_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 10948 bytes
SHA-256: 08856d3de82aa16037152e9c30057a1c228720ddf074ff560c4c638c229797c2

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