Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04a2ae07b0841d0…

MALICIOUS

PDF

74.6 KB Created: 2021-09-13 07:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ece54afed7969b0b86e25bdf9af4d5dd SHA-1: 3f3fb5c3d96dff36093a84e74cf0ed13fd6c86cd SHA-256: a04a2ae07b0841d013167d9861bb6a31b94ac1ea514ba2a5b9fbc8beb47a4d80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs, including one pointing to 'garglob.ru', suggest a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is designed to host a large number of links, potentially for SEO manipulation or to spread malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=android+pogo+spoofer
    • https://illustrations.noche.fr/images/files/rijesogiwuwebad.pdf
    • http://madmojo.com/fckupload/file/zapejikofixepuguga.pdf
    • http://metalltechnik-kutschi.at/19326362883.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/wizifovubararolabeseviza.pdf
    • https://csn-alliance.com/data/files/45989038206.pdf
    • https://crcnueva.naturasoftware.com/uploads/images/files/92578255901.pdf
    • https://expobar.vn/app/webroot/files/images/pages/files/lowulapazazajezowas.pdf
    • http://df-2.de/images/daten/file/woxivibelu.pdf
    • https://efnnma.org/files/file/4003413178.pdf
    • http://gesundezellen.de/neu/userfiles/file/tufoxekuganejemado.pdf
    • https://nordavril.com/userfiles/file/jeror.pdf
    • https://responsible-tourism-alliance.com/content_file/files/nawapakigakimapuf.pdf
    • http://inwallendorf.de/userfiles/file/koxaxepofi.pdf
    • http://hstechno.com/userData/ebizro_board/file/ronulunanu.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7c7e0ecf---durab.pdf
    • https://basealimentare.it/webroot/files/fck_uploads/File/jegabovemudakonit.pdf
    • http://steinbach.casawell.tw/userfiles/file/71168550662.pdf
    • https://elperrocallejero.info/ckfinder/files/wawojajimejud.pdf
    • https://seerupit.dk/assens/file/libumotum.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/2e69e2e9b6a2aaf94dc00f6e37cf873b/zisuferizegoloko.pdf
    • http://ulrike-mayer.de/userfiles/files/nekamomum.pdf
    • http://intemhathanh.com/img_duhoc/files/55290332425.pdf
    • http://pdww.ru/ckfinder/userfiles/files/ridavezowodopa.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_off0000bedd.bin
eaabe0688c30994d8e62ac7ec08be3522c5b0995d4a5adfc54b44c9770586e58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDD 17968 bytes
font_01_sfnt_off0000ede7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 16792 bytes
font_02_sfnt_off000105fe.bin
f8561a4e69d56dcde78dd404cfe3f3e20483d3e3fba4cd70d9e232882e267f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 10348 bytes

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