Malicious PDF — malware analysis report

Static analysis result for SHA-256 238ba4cd8e359a61…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 10:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c78fedef96f30d7504ca326911f5be47 SHA-1: 6754186bf60de6b54248695e31589c1347e88fd4 SHA-256: 238ba4cd8e359a61f08794a1944bc310b62ee1dad7df898650689db8ff3b94e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=best+multiplayer+games+android+2021
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/pijajarewewifu.pdf
    • http://studioarchoggianiepartners.it/userfiles/files/givima.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6bf4499aec3121327c795a9910fccd9a/44929228542.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/10841572324.pdf
    • http://bn-biz.com/userData/board/file/71882110103.pdf
    • http://kaiyudachem.com/filespath/files/20210919235231.pdf
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/14952478211.pdf
    • https://ingatlansos.hu/images/userfiles/file/82447572529.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/11033758697.pdf
    • https://mtmnetwork.net/uploadEditor/files/87743430578.pdf
    • https://dansobentre.net/uploads/file/83981715304.pdf
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/nakerizete.pdf
    • https://molecult.metallo-tests.ch/sites/web/upload/files/90899199540.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/46c8e513585aabc778a2f72e03f8c6f4/rufodosolevakobikavilog.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/diretanejuwipagesaponu.pdf
    • http://yarpb.ru/pic/userfile/gunibezagapopakuwederivef.pdf
    • http://udokutscher.de/gfx/userfiles/files/fuxelozisifaxoziwoxirixu.pdf
    • https://knurussian.kr/DATA/upload/files/202109101459249516.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/badonubovabeniwotib.pdf
    • http://alwaysshine.com/fileimage/file/57511488505.pdf
    • https://olterus.org/contents/files/59983646863.pdf
    • http://americansemitruckparts.com/d/files/8541563268.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_off0000b11c.bin
37e606fec5391299f1c2c60c4686f01a6c4448e688258d7d6b9d1669912d4e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB11C 16144 bytes
font_01_sfnt_off0000da32.bin
19539a15afe119da7d981b1fd36a6ba1a04903433b2da7663957047502255f0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 11296 bytes
font_02_sfnt_off0000f49a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 16792 bytes

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