Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8eb57c442a4c7d7…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 00:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56b227cb264e790eab42bd47b044b038 SHA-1: 931ca2d58b18324c19dfd2aadb659ff3d5ed7e0c SHA-256: e8eb57c442a4c7d786dad490f14f01c1752ce04bc9d0cdb20f42af140b88146c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of distributing links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://kimcert.org/E/file/21738765311.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/43416474271.pdf
    • http://lesen-und-schenken.de/userfiles/files/dixomolavuvuxa.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/81778635640.pdf
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/76975731460.pdf
    • http://shijijiaming.cn/filespath/files/20210916075218.pdf
    • https://ruxthai.com/ckfinder/userfiles/files/8225156762.pdf
    • https://niboparis.com/upload/fckeditor/files/38312636767.pdf
    • http://phoiinnhiet.com/images/uploads/files/pesizijobewarirojaga.pdf
    • http://aftp.bg/userfiles/file/namujo.pdf
    • http://www.sun-green.eu/ckfinder/userfiles/files/85348978708.pdf
    • http://tjsyjdq.com/v15/Upload/file/202191115176517.pdf
    • https://crcnueva.naturasoftware.com/uploads/images/files/4213217144.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143e2376b2a8---57002796862.pdf
    • https://clubesolbra.com/uploads/files/sufigetaj.pdf
    • http://centroolosprato.it/userfiles/files/xuzute.pdf
    • http://uk-finansist.ru/userfiles/file/78943499572.pdf
    • http://bandwidth.aryanpalace.com/userfiles/file/mufokuj.pdf
    • https://www.ijdsir.com/ckfinder/userfiles/files/favolofepibux.pdf
    • http://bienbao.net/uploads/files/niluwatale.pdf
    • http://clarksville.net/wysiwygfiles/file/35240311800.pdf
    • https://garraldaarquitectura.com/garralda_userfiles/files/dirodovefixeridiwoz.pdf
    • http://norrlandet.se/userfiles/file/60317647841.pdf
    • https://tepihtrava.rs/files/69949298617.pdf
    • https://eobliecky.sk/userfiles/file/watemulak.pdf
    • http://futimisdev.com/userfiles/file/mosiwozurazigazo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+do+you+graph+a+parabola
    • 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_off0000b2ff.bin
ece0a75b599fbf260d8ad90c6301cb8e6241d9e9f1ef9fa8ed664c19b36b3a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FF 10508 bytes
font_01_sfnt_off0000ca89.bin
53cf6d5831a1710485084f80b3c6dd634ed1ef5166a49f71dc8aaa0713b70055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA89 16920 bytes
font_02_sfnt_off0000f5d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 16792 bytes

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