Malicious PDF — malware analysis report

Static analysis result for SHA-256 404b805f3f95e4fc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 19:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cea2c592d772d3c7239710d904db88d3 SHA-1: 1cafb3af9f4fa2b6328d40c7fc5a4a00e298518e SHA-256: 404b805f3f95e4fcb3d08978bb2e0f8edd12878cbf52a5f2686d5c4e49d2d3b7
134 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=pubg+apk+download+2021+india PDF link annotation
    • https://intrigantka.ru/images/userfiles/file/70927318601.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/de352b4f8f7a7b7bf7fe97f9c64dd107/sekozesusimefu.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/21088768930.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/gaguw.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/bujekapupuse.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/kigoxagopumodejivamuna.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/85455615406.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/2968269757.pdfIn PDF document text
    • http://kdekdyjak.cz/data/nomugidowowefobimorugorit.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/6659779893.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/penaliwididodifelejis.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/87882612985.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02b6ce126---pesotavobuzusuwenim.pdfIn PDF document text
    • http://chikatere.com/Upload/files/13074556785.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/95034773959.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109091534053228.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/zixebowujizasipa.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/98567174350.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/47281958886.pdfIn PDF document text
    • https://binhvi.com/upload/files/63393632593.pdfIn PDF document text
    • https://wildnaturetravel.com/File/89954266038.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/89823946760.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_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 10784 bytes
SHA-256: 228cbf9bc18da4eb6e02d767c9e8d3737b68fd7d28c14c6c22984e538d7ad434
font_01_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 19640 bytes
SHA-256: 4c6404297bd27f07f6bd1b029a93947fa46e857aba64e67ed08f359e7a6eb4ff

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