Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af547b4eb9d1291…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 07:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d2b9953e4b5875dbdd34a4d96e7267e2 SHA-1: 5e44870dc391dc25be79092de71f66aeef7c8424 SHA-256: 5af547b4eb9d1291cc527759faa985592e7b5c8d8dd6c192a083c548da531afe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content. Although no scripts were explicitly extracted, the structure and heuristics point towards a malicious PDF designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://thediamangroup.com/_images/files/jutixerilevinadexuvuzek.pdf In PDF document text
    • http://hoadon-dientu.net/images/files/putelamamika.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/gadabuzokagizerolepirol.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/zukedej.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/nopaselajogiwiwuxa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380baad63c9---35748593366.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/bezovewulinik.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/19348104750.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/34500434311.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/9816181985.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/45468352679.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/65378130100.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/50890373695.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/14836877668.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/45601523342.pdfIn PDF document text
    • http://baove24h.info/upload/files/27384267280.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/rizapupaxe.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/92763554888.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/vekinelu.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/nofamegitudo.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/tibus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=a+silent+voice+movie+onlinePDF 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_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 10176 bytes
SHA-256: 9a0b75039fb8ed38a61592b736951da2cbd71f0b4a4a23b17221a37fdd099d90
font_02_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 18048 bytes
SHA-256: ce08776a2b72aaf330ffbd7360d852b910596e78a32b063c226fdbb823beaebd

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