Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44eeb2b36f80148…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 18:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8d3c7060f4c6d0d60593aba2c23a8a8 SHA-1: 99db02dd8c0e74fe633542a47ecae922e4c3c076 SHA-256: b44eeb2b36f80148cc3d7caaa906b48293a49050a8d8c09ff2f8367fb01534d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sfipl.in/userfiles/file/wodijilami.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/mewadagowasa.pdf
    • http://hijoin.hu/editor_up/84001398205.pdf
    • https://gites-les-bardots.com/userfiles/file/wapewoxiwexum.pdf
    • http://rvhifi.cz/files/file/jarexovidukuz.pdf
    • https://www.abandassociates.com/ckfinder/userfiles/files/bonexoroxobegojutix.pdf
    • http://gibisch.biz/files/files/makokuzugotetixid.pdf
    • http://espicycooking.com/files/file///gosipawutowon.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/finak.pdf
    • http://precisao.net/files/files/80234408093.pdf
    • http://eventologia.com/userfiles/files/56166482730.pdf
    • https://novinfasteners.com/userfiles/file/61502010017.pdf
    • http://kuryakyn.ru/userfiles/file/nezavufoxebudaxaxulura.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613573d7cb285---37500135674.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614570181116c---61826339888.pdf
    • https://galerie-louise.be/userfiles/files/5604390494.pdf
    • https://k-barrierfree.com/FileData/ckfinder/files/20210912_BC7BA4291F5BD3D5.pdf
    • http://esteticka-stomatologie.cz/files/content/file/25740883229.pdf
    • http://flemingdecal.com/uploads/assets/file/32000377838.pdf
    • http://pop-around.com/file_media/file_image/file/tutarevisisalomorazoze.pdf
    • http://ornito-silesia.eu/userfiles/file/konuw.pdf
    • https://lideregitimpaketleri.com/calisma2/files/uploads/51423057327.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+eye+of+the+darkness+book+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_off0000ae7b.bin
6a45082933545918650f3579fa023671d6751efb2f720bd95aec414c6d74921f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7B 16948 bytes
font_01_sfnt_off0000d966.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 16792 bytes
font_02_sfnt_off0000f17d.bin
7276caed2347508b8d684bdc0fb84b8e43983ed2399dafa460eea5fc5a4f8d9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 10764 bytes

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