Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6bb0dfa00ba41c…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 21:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d99041fab3fc2f2cea4b73f375e53b3 SHA-1: 794de23dadf64ede53d7b74880f048c451b78f95 SHA-256: 8c6bb0dfa00ba41c9021a1b7ae08d8bbc6ba1a0e81e5b014b6eff504e27bd5fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded URLs point towards an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://wastran.ru/uplcv?utm_term=sukumara+swamy+kathe+summary+in+kannada+pdf
    • http://thinhhoanggia.vn/Images_upload/files/3051949439.pdf
    • http://gemculture.com/userfiles/file/pekinezejovanowadizo.pdf
    • http://santehnika34.ru/images/file/desofeguxiseputadiwi.pdf
    • http://halmar.info/userfiles/file/pewukakiw.pdf
    • http://stardentalcare.org/userfiles/file/1481986341.pdf
    • http://uelzecht.lu/userfiles/files/fubogigepepupazur.pdf
    • http://luluscafeonline.com/uploads/files/44221466119.pdf
    • http://fisioterapiasuzzara.it/userfiles/files/komelokotiwajilixejal.pdf
    • https://baoholaodong24.com/userfiles/file/gemerazi.pdf
    • http://absolutelyneon.com/userfiles/file/240384573.pdf
    • http://maytinhgth.com/userfiles/file/powerogofok.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/foxutaxubavopuvukigiwifev.pdf
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/21267147640.pdf
    • https://alshaabcoop.com/userfiles/file/97993534183.pdf
    • https://xo-sound.ru/userfiles/file/damejuto.pdf
    • http://erainbowrealty.com/userfiles/file/pepeluduwik.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/81b1d642569e4f20ec531438c14c8a27/61052846117.pdf
    • http://alpha-th.com/userfiles/file/danaremadekitewamita.pdf
    • http://willbramephotography.com/givumetudesujomefu.pdf
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/putebul.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a26a2dd77a---gitebore.pdf
    • 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_off0000c00d.bin
d11aca18276c1f6d04487473150e0759229ea244c119b5e356fa70ebe3e864f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC00D 18484 bytes
font_01_sfnt_off0000f0bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 16792 bytes
font_02_sfnt_off000108d3.bin
9a794c2a0945a1a71ded7f2a90838d725becd9a96dbc7ab27120e9afa5c98948		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 11064 bytes

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