Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a39d8126cf233a…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 12:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39d211250cc4927916587e7b5929f9a9 SHA-1: ec5388c60ea380515b56f11a6e39a3dcf847aa43 SHA-256: b4a39d8126cf233a007a34fc195dd1ba8c4e05d73b7005267bea872ec7388753
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://energooptima.hu/upload/File/pijafo.pdf
    • http://ediljolli.com/userfiles/files/97443173927.pdf
    • http://cbgnfinance.com/userfiles/file/44970222995.pdf
    • https://clubkdo.fr/img/pics/files/18935570971.pdf
    • https://ww150002.linebot.net/upfile/files/20210923101501.pdf
    • https://chptravel.ir/data/file/jutiveluvuwori.pdf
    • https://gencatakan.com/upload/file/dalubob.pdf
    • http://coolscape.info/images/files/40776133144.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/waxusotiwatolegiwar.pdf
    • http://iraneto.com/basefile/iranetocom/files/gisezo.pdf
    • http://preiss.at/upload_files/files/89853585597.pdf
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jedotusoratitesivajeragum.pdf
    • http://bbbo.handyfriendship.com/upload/files/48608630064.pdf
    • http://nomorecpapmachine.com/userfiles/files/wirivavora.pdf
    • http://urduhadith.org/survey/userfiles/files/zikotawuw.pdf
    • https://superchills.com/userfiles/file/19884422581.pdf
    • http://tichdiem.surecare.vn/uploads/userfiles/file/rilasap.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bde11b3da6---zotetav.pdf
    • http://joltiy.ru/uploads/files/gajomuwumegabivowov.pdf
    • https://ristovski.mk/public_html/upload/userfiles/file/nusifafovuduso.pdf
    • http://limuzine.md/userfiles/file/padolidumipivunufotagot.pdf
    • https://ccs-corporation.com/ckfinder/userfiles/files/texudigeledinegonagarokij.pdf
    • http://tranhdaquydep.vn/upload/files/40174583649.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fifa+19+android+gameplay
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b824.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB824 16792 bytes
font_01_sfnt_off0000d036.bin
fcf3e8339b1d1cafd3fae6a2e6bf5a2d5a86338fef25da3cf3d6f8b24d3a384c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD036 16728 bytes
font_02_sfnt_off0000fbe3.bin
61d7b15260e86efc65fba58aa8b2ac6754d30ecb7c0dde04e338d69d28b776a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 10888 bytes

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