Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5252edaf800d600…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 23:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66f940096c3e744b9beceb633acfa862 SHA-1: 763558878da188133d862649e2b40fd0045bf4e1 SHA-256: f5252edaf800d600a6206f0b081ddd28154d2834b507a851f7113aa001cf1ed4
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, many of which are part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination by using many disposable domains. The primary URL suggests a lure related to downloading a game, likely to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://irlanc.ru/uplcv?utm_term=download+gta+san+andreas+gpu+adreno PDF link annotation
    • https://cpsguffanti.it/uploads/file/wamebebemanedet.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/5924505981.pdfIn PDF document text
    • http://isvpro.com/custom/files/35380124044.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/merunuwa.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/27117766199.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/zorutomomekuw.pdfIn PDF document text
    • https://fq.ua/images/file/54038181739.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/8897246503.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/9416272473.pdfIn PDF document text
    • https://afma.pt/site/upload/file/88860298983.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210909_4C300E118A83B2E9.pdfIn PDF document text
    • http://nessium.net/userfiles/file/91187525920.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/kazovafebunitono.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/36724955115.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/faborivixutiruwijigew.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/wezopekok.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/83004321577.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/64697472572.pdfIn PDF document text
    • https://wildnaturetravel.com/File/luvonibifigokuribalasel.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/38105527297.pdfIn PDF document text
    • https://airbays.com/userfiles/file/taletewatozadefavenav.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/45827129386.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/fuzifuxamukobulite.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/86248448492.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93089123649.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_off0000c6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ded9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED9 18780 bytes
SHA-256: 8d4fe2da4f7fcb737dc2f5dfba8e79f56de14f556c9580187d03536cf81c1ef9
font_02_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 10664 bytes
SHA-256: 24ba83dce8ec4c85f6d5343e1177dcbefaeaba6f38536887316386851336ca2d

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