Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e554256b74c1b7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 19:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d2eb7692e1a7e9c58e59419426b0549 SHA-1: acb70dbeb5115f53b8f42b3f68e6560f8bb52523 SHA-256: 12e554256b74c1b728fedd786bd4f9a04df1d39f959a6a0554eff3efce84c6b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various external PDF files, likely to obscure the ultimate malicious destination. The presence of numerous unknown URLs suggests a broad attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://pm-ural.com/uploads/files/dozipewulekoxobetirilozes.pdf In PDF document text
    • https://led7.ru/file/zozemozekovo.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/34899147880.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/wiwuf.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/86755362583.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/57176491076.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/bewodavuruzulod.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/58246093717.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b20f8c035af82173ca8af4231f7a39fc/58711356120.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/dakazosupabawezusazot.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/mumufetet.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/42799897161.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/53226646973.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/31158964930.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/23194952735.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luxasazubefaletinin.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/favatunuzida.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/62932973385.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/17845962970.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/pidaditajobotijivokele.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa9e2ce10---divigamu.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/lobuwowem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+diamond+hack+gbaPDF 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_off0000d9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C1 10636 bytes
SHA-256: ced1c6e4ff3284c9d001e8b71cf5cf19aaf62b8c7ada71f623da3dd6f31bf8da
font_01_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 20412 bytes
SHA-256: 60813070dc8fca8e01d6d1edab349d2ffe102f7cf6eacb2e2446b825be24a710
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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