Malicious PDF — malware analysis report

Static analysis result for SHA-256 813571a1028dfb28…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 03:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ed426124e6ba579d2b05811a2f68488 SHA-1: c037beb9a8814489fa5cf8c9176094dfe53cfc72 SHA-256: 813571a1028dfb28ac2ce379df3170f30405d50ea6916f6269d60ac18e402568
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to disposable domains, suggesting a phishing or malicious redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior, aiming to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.autoservis-hubatka.cz/admin/upload/ww/file/35128915046.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613833c78bd77---pexusebuveton.pdfIn PDF document text
    • http://igruppe.no/ckfinder/userfiles/files/kekanu.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/wetepalekidoreli.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/xuxubogunarodevani.pdfIn PDF document text
    • https://maviet.vn/upload/files/parosavedupevoke.pdfIn PDF document text
    • http://htwy.com/upload/file/8576236224.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/3169188051.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/guwugifujonanomuxufal.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/lotavuwomipotamebabebiki.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31323135204.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/tosafezagitivadoto.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/baderofusumofukug.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xivapagazem.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/40376886431.pdfIn PDF document text
    • https://luminex.pl/upload/file/85874486861.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/zoxodilemewetatukoludaje.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/vitufor.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/famebazoletisi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/b5u97alfgv2668fk4n6ra5i8gj/98092327898.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/43463635300.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/popepikako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=why+android+phones+slow+down+over+timePDF 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_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 10916 bytes
SHA-256: 455664d71d075f1f251959420a8a84ca1f6ae1292507c158fc39d180e03f4989
font_01_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 17620 bytes
SHA-256: 70bd8df81f64e7b5cc3aa2d03f8e7a101a7b8c6dedca3a46fdc4a870b2d5d3aa
font_02_sfnt_off00013002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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