Malicious PDF — malware analysis report

Static analysis result for SHA-256 0646aecafd41835b…

MALICIOUS

PDF

68.6 KB Created: 2021-10-04 10:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 29f23a5ad2670b61bdd315931927e074 SHA-1: 60dc3baa7f07528fdc5a5bdc53b09daa10488fad SHA-256: 0646aecafd41835b9d2da87ddc3b9fe59412924b7dfed79794655c5d6d9e25fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are structured as link farms on disposable hosting. The PDF's structure and embedded URIs suggest an attempt to redirect users to potentially malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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=difficult+algebra+word+problems PDF link annotation
    • http://aromata.ru/upload/files/geferomagapewabu.pdfIn PDF document text
    • http://tercovci.cz/files/file/vozogepiresefivusopagoxem.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/15350167992.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/vunojabexe.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/dulap.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613530b62537f---zerir.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/dovadoxogilubepeso.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/ligotavuguta.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/21670056635.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/wagoletezab.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/45256836213.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/jezixebasuzovudibujakelom.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/velerizulefuvujukadux.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/lutoxulutafirope.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/mujirarapifugumulaxipavo.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/25588719776.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210930/file/16330003345685.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/xogojonupaporu.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/83846997567.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/jijuwikepuzofatoze.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/713418666.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/wusofebamisepipitagu.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
stream_003_off0000c472.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC472 15448 bytes
SHA-256: 818b7487f4f80ffc9b128e0639f637c26677b18ae7f8c5f32a19c18dcb0a4f14
font_00_sfnt_off0000ac60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 11188 bytes
SHA-256: 6586f37819174b1d585cd679dbae6b9d4a39f2362d62affd80edb3da4a6c6a70

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