Malicious PDF — malware analysis report

Static analysis result for SHA-256 c727aeedc8296b88…

MALICIOUS

PDF

71.2 KB Created: 2021-09-14 04:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8e7f3311e28c6e9292bced8cbe6e737 SHA-1: 2fd0a2023afa55a314ffd66ac206359e4e10c0af SHA-256: c727aeedc8296b88c25f05498a32eeeff7de4054c160fdb6bff03bc0d3efdb3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for malicious purposes.

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://pistant.ru/uplcv?utm_term=hero+of+sparta+android PDF link annotation
    • http://mamam.by/upload/File/file/nudebi.pdfIn PDF document text
    • https://limadelimon.com/images/file/17878453428.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/82303494757.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wujavezufopopo.pdfIn PDF document text
    • http://canadianrockies.info/files/file/jazulavepan.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/sixemoxubagadapoxevexa.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/99575106470.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/nanetekanupabojef.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/5178233704.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/66225986359.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/lejeviperifetudizej.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/30612225690.pdfIn PDF document text
    • http://orderkai.com/uploads/files/56640767841.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/56226728599.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/fufeli.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/fisufotonisetagukuraze.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/78597024850.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/57717947390.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/54364706249.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/gilepaxudagebutosopijoba.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2qk4v2kan3tgfok1q594epto7e/joxowukixesimuvut.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/89925161161.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_off0000b5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C3 16308 bytes
SHA-256: 800cee3916a918df1a24e401fbe86ce988b4a7dd320e17ed30b9cb3a4b74f0e9
font_01_sfnt_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 10436 bytes
SHA-256: 6206d89334ac76ffb1d23e8444ddfa630e55511354f1f3bb9297e5767308699f

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