Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12cf885ce56c221…

MALICIOUS

PDF

87.8 KB Created: 2021-09-21 03:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fb683a79001005bc338113b133cc69b SHA-1: 069ec10ec96bc3560ca73dba525b45d846d29721 SHA-256: d12cf885ce56c221ff7b8b7015cd8b08d429bf99f204b512d68e0d8442bdcc28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs strongly indicate it's part of a malicious campaign, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://krisoc.ru/uplcv?utm_term=dhoom+2+full+movie+watch+online PDF link annotation
    • http://captainkillmite.com/uploads/files/202109132322026462.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/xigolazakox.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///61445607295.pdfIn PDF document text
    • https://novitas.ro/files/31583827199.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/39357300225.pdfIn PDF document text
    • https://kildevangen.dk/files/pidapujedodexijajub.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/gobedo.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/92974618471.pdfIn PDF document text
    • https://5udua.com/contents/files/97948879455.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zigarosawalet.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef55459872---renar.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/suwexa.pdfIn PDF document text
    • http://gewald.ru/content/Files/85783072551.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631485686.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/babixazapewif.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/54432274847.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/3174276496.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/xezavizufedodanafomowuxup.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/74424935106.pdfIn PDF document text
    • https://preciseenergygroup.com/media/86898664275.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/boxulufabelabuneta.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_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 17740 bytes
SHA-256: ce8a38994b02cec78980bebec38079fa450eb549c18a1edd56d8f1fb7b6ad0a2
font_02_sfnt_off0001395c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395C 10708 bytes
SHA-256: 9efd07f53e54068377ac398cf702fd3bfa9889354f75c65b4b866b96f985c376

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