Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da32dc4e2e23bfe…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 13:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28f0b00a903a46b03d0d216e87d912d7 SHA-1: 8be7876191c9d7c3ea98f0cd34b1b292dc50b81c SHA-256: 7da32dc4e2e23bfe6b016f475851f5f517ffbc42b1897c2bb090586297d89272
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to various unknown domains, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://korsorlampang.net/user_img/files/kilasaxojenaregatexod.pdf
    • http://tienhasteel.com/app/webroot/upload/files/88257935701.pdf
    • http://e-sportis.com/images/upload/32542312027.pdf
    • http://sushi-belovo.ru/files/71537281898.pdf
    • http://lso-msm.com/userfiles/file/pepizadoresimujini.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/kamigubunilibezamojuzegi.pdf
    • http://www.cpiequipos.com/assets/images/user_files/files/76992587893.pdf
    • http://www.heatandgas.com/EditorImages/file/zikoxonav.pdf
    • https://hoangphatdanang.com/uploads/image/files/gabirinasewarodagubovusux.pdf
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/tulivudovatoxu.pdf
    • https://nusamulticentralestari.com/Uploads/userfiles/files/luzadusalofi.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e42e06521e---5797852460.pdf
    • https://thietbixanh.net/uploads/files/vapiwawagiwonisojadej.pdf
    • http://qigong.ru/userfiles/file/70651738777.pdf
    • http://everintelconsulting.com/upload/file/202109040359280033.pdf
    • http://ccsl.asia/files/risosadobuzap.pdf
    • http://photopuzzle.net/userData/board/file/9148679765.pdf
    • http://digitalpolicycouncil.com/imagenes/file/72069235858.pdf
    • http://leebyunghun.org/new/upload/board/files/43088228217.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/71160002396.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/4ei4bm995qb126gro37pc0jlk4/polekep.pdf
    • http://gamaxmotor.cz/data/dokumenty/libutulev.pdf
    • http://moderncarrent.com/user_img/files/38903635114.pdf
    • http://summitremodelinginc.com/userfiles/files/gozobimupiwinulobuzakedi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=icon+pack+for+oxygen+os
    • 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_off0000d880.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 16792 bytes
font_01_sfnt_off0000f097.bin
63d23406714e2da759ef5cf227d31ca6d46ac1999303972fd91b88cfc7406e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 10680 bytes
font_02_sfnt_off0001094b.bin
a2aa0b46501bbc81068fd376d1eba6b4061dc87fcc78f0155937d0d9b99e2ec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 20576 bytes

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