Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff5730a379f961d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 11:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 709291ac5a90a8bccb7599531ee24f07 SHA-1: 93479d968002f7d3d40625a94d984fc4f9c9f28a SHA-256: 0ff5730a379f961d0ec456b4b87bab8d0cf5918e8d1fc80b93cd1304efc03b6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=o+sacred+head+now+wounded+bach+pdf
    • http://st-communications.com/ckfinder/userfiles/files/28158809166.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/ribikupabajemosirikeze.pdf
    • http://china-guolin.com/filespath/files/20210901231459.pdf
    • https://deepex.hu/hirek/files/komarajokaxuf.pdf
    • http://greenbrier101.com/userimages/gavanu.pdf
    • https://bahceneryaman.net/public/content-images/files/vafokixegakajelegajipinod.pdf
    • https://quatden.vn/webroot/img/files/81664638293.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/pazujelelipujut.pdf
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/papeduwubi.pdf
    • http://ottotech.center/userfiles/file/19997309394.pdf
    • http://akinmedikal.com/uploads/file/50602763022.pdf
    • http://zoo-foto.cz/userfiles/file/23278498570.pdf
    • http://e-motyle.natura2000.pl/imgturysta/files/wufuduzagawotebifat.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/puguxufilimuvurojuxap.pdf
    • https://limsurempat.com/contents/files/wasapar.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fc31d1b5---vijilupi.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/47561475663.pdf
    • http://eminenceinc.com/userfiles/file/10755566504.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/jojepirulogedudesutum.pdf
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/62733079702.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/50e1c89b8c2e0fa0ee70cbe7f23c4841/87652519273.pdf
    • http://villapellegrino.it/userfiles/files/91289941176.pdf
    • http://geofer.eu/userfiles/files/80501494796.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_off0000d1f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 16792 bytes
font_01_sfnt_off0000ea10.bin
1bee231d9ea13e654d07a98106c011987c77803e64bf2240d8db075c5be7054a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 10832 bytes
font_02_sfnt_off000102d3.bin
d7b8962dae60cfff1872a3709904fff1c190e02c2602da35ba8ebbea23c5bbe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 19504 bytes

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