Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ff623f859ff1eb…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 16:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4669ff25803c4b8ad802fc0512bff61 SHA-1: 6aa639a1edda20a83e3b79fcd9c9933ce8e0d308 SHA-256: 23ff623f859ff1eba0bfa677891f6aee2a403c9d9a4ca8a156ad5bb37a2107fe
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 numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple domains. While no scripts were explicitly extracted, the nature of the PDF and its embedded links points towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://tourhong.com/FileData/ckfinder/files/20210921_2D68A278BE4B4E5A.pdf
    • http://vedepcuaem.com/luutru/files/lifelosutoj.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/69968276699.pdf
    • http://tatagz.com/uploadfile/files/sozozodez.pdf
    • https://mfdesign.hu/files/file/39047449012.pdf
    • http://sanzmendia.com/userfiles/files/wokavuvawakisuguto.pdf
    • http://leaders-adv.net/userfiles/file/76269956993.pdf
    • http://xn--z92bzy85x.com/userData/board/file/54938904649.pdf
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/76528058135.pdf
    • https://onlinendttraining.net/files/68099307895.pdf
    • http://dgkno.cn/upload/1161622574.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/60243415735.pdf
    • https://textmakareknutsson.se/upload/image/jafejidixuguxupilugitijof.pdf
    • http://files.ibiza-ferien.de/file/bavawijoxadurumez.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/83519323378.pdf
    • http://hibertek.com/image/files/20210924_103028.pdf
    • https://safetypadlocks.eu/eurostyl/photos/file/tomoxuluratinebemukejow.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/28695533452.pdf
    • http://caerulumpharma.com/upload/files/75617915038.pdf
    • http://vitccorp.com/uploads/userfiles/file/faluwubexeligebi.pdf
    • http://gramercygrand.ru/files/file/walirirokatovurewiborigu.pdf
    • https://echipamente-scule.ro/userfiles/file/7145915020.pdf
    • http://varosom.hu/userfiles/files/nazebebefifatagurevofuzow.pdf
    • http://egitara.com/upfiles/files/58456111758.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=viper+mk+iii+combat+build
    • 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_off0000b213.bin
2e4d987226b0e739915215a991cb942d69803473efcc92bd0e5dec26ebc01abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB213 10704 bytes
font_01_sfnt_off0000ca6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6D 16792 bytes
font_02_sfnt_off0000e27f.bin
993ffd4ef6e7e11309fd89ec2ebd7b5bedce5064a43d75cc332a90256182d18e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 16868 bytes

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