Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed8173be5153472…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 09:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09306e50b5794139ca85fecd8ee5ea22 SHA-1: 1a19f5acbd3bccb72b84b51a3d8f3e1a1d1c322c SHA-256: 6ed8173be515347224f58066df2b928f3cd816416b4368cad5bca0b5c0819d5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs and the PDF's structure suggest it is designed to redirect users to potentially harmful websites, possibly for phishing or to download further malware. The presence of external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=gta+3+obb+file+download+for+android PDF link annotation
    • http://grimastone.ru/files/57007558589.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/vixuge.pdfIn PDF document text
    • http://agrion.org/upload/fichier/zujifizedojake.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/xavegifaju.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/57809946066.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/13223722600.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/88777094138.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/sabirake.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/wivojaxovij.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/44594100341.pdfIn PDF document text
    • http://synhbio.com/upload/files/75660711322.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/zikekixilaku.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/16071199665.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/woxadezu.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/18177194730.pdfIn PDF document text
    • http://africareview.in/userfiles/file/1956485339.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/mojogigusejivotoxipimula.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/xaroka.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/11318669051.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/23833292422.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/xotagabutetomonabaxonikol.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/bumagafonexote.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/76174847266.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090720194458.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_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 18004 bytes
SHA-256: 164b5967e2ef8ddb7d08a570e9b03a967d5cf3eeac176e51f4e2f32c5b91cd1d
font_02_sfnt_off00012704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 10616 bytes
SHA-256: 7ecfb2bdc82ed27db81307b482f7e29f909e107447b6e72ef3825e14a6dfc39a

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