Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9339101f401ba24…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 04:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 527300b6682a84bd7767f1f00739a86e SHA-1: 431d34455ff24cff094fbb8d434a8e1ace6224ca SHA-256: b9339101f401ba24b42625d3f452db9b3ee62969f17bda297815ffd939df5bc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to link farms hosted on disposable domains, a common tactic for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=como+formatar+celular+sony+xperia+bloqueado PDF link annotation
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/98275373299.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/98940592821.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/730892603.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/39641557462.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/juguxewopelo.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/44258801559.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/43403451774.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16140fdf531100---lazijidowimibekokafexu.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/43546507554.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/6117705447.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dulegotunom.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/rexaxugunedaxanuxazog.pdfIn PDF document text
    • https://eclearusa.com/images/file/85134986092.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/fupodituwalup.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142861bb22f7---baduzatesitoxurorukirami.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/84968536501.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/lomepuruvura.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/betekenejaxazani.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/debete.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161304226309e0---32216219753.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 11416 bytes
SHA-256: 9d4e641cef602ba68ca6272de7dffc6851d9f13253dbc08bb8118004a6b52c8f
font_01_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 19324 bytes
SHA-256: fdcdde909904a092bfad36b15fcb29fb89ae199436ea66db5263c8d4a139b71d
font_02_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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