Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2295c2b890c0091…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 22:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3396c450243196cdd46f43c158df2d9e SHA-1: 7ab68396661e7511eb4f7c7173d0b52be81bc633 SHA-256: c2295c2b890c00912dc6322df5a1129f4dd2d6ec8a11cc884ba56af424936414
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which appear to be part of a link farm. The primary purpose seems to be directing users to potentially malicious websites, indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown-reputation URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=android+how+to+find+wifi+password
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30637325787.pdf
    • http://potya.com/jufibapimuxesuv.pdf
    • http://naturalmis.com/userfiles/file/dipamovusabaw.pdf
    • http://kredoteka.ru/uploads/file/muxidufiwux.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/48467039462.pdf
    • http://buyyoutubesubscribers.com/ci/userfiles/files/83945014613.pdf
    • https://rajatotogroup2.com/contents/files/9415234335.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135972054db8---xurobexosuf.pdf
    • https://gbagencement.fr/uploads/file/91116736309.pdf
    • http://www.moyekolodin.com/files/zubogiweral.pdf
    • https://stonebuild.bg/f/uploads/files/marevakafubitewisova.pdf
    • https://yocarbroker.com/upload/ckfinder/files/62508858909.pdf
    • http://charivne.info/images/file/12862952410.pdf
    • http://gioiacompany.net/images/upload/file/werenapu.pdf
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/2629257923.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/68d2bec8b9858d903b7f251a6fc86480/10919093817.pdf
    • http://biomehl.com/images/content/files/89875544352.pdf
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/zurozezugisax.pdf
    • https://indiantiffin4me.com/nbloom/fckuploads/file/57264228019.pdf
    • https://yukkumpulgroup2.com/contents/files/mafimezekize.pdf
    • http://lex.tj/img/file/rebipujovapivarizoxemuse.pdf
    • http://work4shop.cz/userfiles/file/nukofapigivilinejirowod.pdf
    • https://produktybhp.pl/pliki_user/File/lakosujivewawekef.pdf
    • http://platcometals.com/images/file/suvamiliwuf.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_off0000b324.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB324 16792 bytes
font_01_sfnt_off0000cb36.bin
12f246fb09bef5c25e38415323c9b0f63d780fdbd2356614d4fa92203cd426f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB36 16376 bytes
font_02_sfnt_off0000f464.bin
183d121f48b818d855b2d1b52f08929799d735c9e81fc2cb353617ffa5e5c221		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 10484 bytes

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