Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c5d5a6963ce9b1…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 15:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7354b1a77b6467389c4fb5da1e2eb105 SHA-1: f251d32f8139341eac5245dd0cb8f5d72ca872f2 SHA-256: 36c5d5a6963ce9b1e1878b3dbcb08023a3367e19951c1b9a3af66b88f976a9a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to external sites, many of which are structured as link farms. The presence of these links suggests an intent to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=what+is+joy+launcher+used+for
    • https://radekslodkiewicz.pl/files/file/43525133683.pdf
    • http://phongthuyphatloc.com/luutru/files/faguwavipevadep.pdf
    • http://attlas.center/userfiles/file/jinazosizuxune.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/26989468118.pdf
    • http://nepalbestcargo.com/userfiles/file/nakazugibopikam.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136d353f0f17---datizeja.pdf
    • http://africalegal.nl/userfiles/file/jemiluve.pdf
    • http://the-bom.kr/upfile/files/samaruvavexutoj.pdf
    • http://liavanhaeringen.nl/userfiles/files/giludenux.pdf
    • http://quatanggiabao.com/images/uploads/files/widowonemeribelamomoti.pdf
    • http://tw-tms.com/uploadpic/xw/files/58157162101.pdf
    • https://semot.com/Store/userfiles/file/26133989749.pdf
    • http://podiummoda.ru/userfiles/file/nizowumipuberid.pdf
    • http://vititanon.com/user_img/files/mojixubis.pdf
    • http://jujucuisine.com/userfiles/file/lopeg.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/barudeja.pdf
    • http://duda-tech.pl/dudatech/upload/file/36257449877.pdf
    • http://ausafe.net/images/art/files/94850365757.pdf
    • http://ivankrivanek.com/userfiles/file/biguxagaripowe.pdf
    • http://karpatskiles.ru/store/file/95371054239.pdf
    • https://dansobentre.net/uploads/file/sisijadisiwavap.pdf
    • http://hosteleriayvending.com/ckfinder/userfiles/files/72611110661.pdf
    • http://lagunarent.lt/ckfinder/userfiles/files/wikebajesosa.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_off0000b29e.bin
b4ddfc1c778a0041a19aa3bf659a05ac42d05e8b1f756954c117e921f6f13d8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB29E 17232 bytes
font_01_sfnt_off0000dee7.bin
f70619d63353d5dddd03ad7f0e443069818d5bac60dc3eacbc45f8da940fd181		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 10908 bytes
font_02_sfnt_off0000f819.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 16792 bytes

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