Malicious PDF — malware analysis report

Static analysis result for SHA-256 29606687c3a08829…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 00:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cda269344b5cc2ea5cc710125af1e624 SHA-1: 4afa71087e235ee8d1ccbc64856f225b36517099 SHA-256: 29606687c3a0882981ca607b78ea34a8b1d2f872d1c9bc80bcd2cd53ebc2679d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=what+to+do+with+an+egg+in+minecraft
    • https://zzhqhi.com/d/files/kaxixasuvululizowu.pdf
    • https://hmradiatoriai.lt/images/files/kabixezilulazefi.pdf
    • http://naphogacomposite.com/upload/files/26144935108.pdf
    • http://orthopaede4you.de/userfiles/file/95117771216.pdf
    • http://4reality.cz/userfiles/files/44676844368.pdf
    • http://meimagedance.tw/ufiles/files/81670797024.pdf
    • http://srs-budapest.hu/uploads/files/25242966887.pdf
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/nunodivogidar.pdf
    • https://chataigne-cevennes.fr/imgs/files/87904459956.pdf
    • http://snft.ro/media/file/22239731334.pdf
    • http://stomerijindex.nl/images/uploads/webeto.pdf
    • http://nriloan.jctoursandtravels.in/files/ritulivotajosofo.pdf
    • http://alliance-ic.ru/uploads/file/60619290828.pdf
    • https://repetitorebi.ge/userfiles/files/woxata.pdf
    • https://sibservis.com/ckfinder/userfiles/files/gurarifamimilun.pdf
    • http://cga82.com/admin/File/vasavubofakurux.pdf
    • http://dental-forum.ru/userfiles/file/neganajaxikugoruwaxu.pdf
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/6053111639.pdf
    • http://aucoindeshalles.com/menu/file/1556982811.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16134920ce7285---96372424108.pdf
    • http://jmk.kr/ckfinder/userfiles/files/85244838296.pdf
    • https://pcetravel.com/files/file/mugup.pdf
    • http://hnfond.cz/storage/file/vowibuzajaputewila.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_off0000aef5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF5 16792 bytes
font_01_sfnt_off0000c70c.bin
d0209d68846d8d6dfc20d76ff336ff1240abd8ecbedc58b063b9356558736a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 10788 bytes
font_02_sfnt_off0000df84.bin
4bd4162892fc4389f5e01e0e2deb6c0a4aae5261a4585a7611b1180b0b5f7270		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 16508 bytes

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