Malicious PDF — malware analysis report

Static analysis result for SHA-256 887f37ce63c30e31…

MALICIOUS

PDF

78.0 KB Created: 2021-10-07 13:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4db637e1210e03e08d05f0e9b40e11e8 SHA-1: 4b655d26756038b68ae8b5e66a1be67901bc1dde SHA-256: 887f37ce63c30e3115c1b30b1917ffbdab481ffd5a4e116161eaae407f7e20ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and heuristics point to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://dinskayarealty.ru/media/file/71368929721.pdf In PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/junesuvo.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20500637280.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/85231885563.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/25678485177.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/xexawunovugulanodawe.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/34032673525.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/61623512902.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/litavitas.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/58051574192.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/41348101608.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/nasonogufimefevawi.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/36003471733.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/xedivumasogujugizile.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/77676355544.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/39010771385.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/87134673181.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/pexajegojalamefi.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/22703425099.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/juzudawunigukogup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gain+of+colpitts+oscillatorPDF 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_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 10380 bytes
SHA-256: 1a5ffafdb503b13ba3321356b1fdfd9c2562c2d7dfb48bb54f221e7867b13cab
font_01_sfnt_off0000e173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 18700 bytes
SHA-256: 01419909dffd509f2ffa5cc180805dbd8c38a59c946ae83134666f8f73d5929d
font_02_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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