Malicious PDF — malware analysis report

Static analysis result for SHA-256 0168f2592b3a8333…

MALICIOUS

PDF

70.4 KB Created: 2021-10-04 05:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5ec497a1f40d8cbfb5637125f8756a5d SHA-1: 13a884c608d01503c3d2724fbb5253c4799a17d2 SHA-256: 0168f2592b3a8333befa5da7d64ea83d9820e906f2d639c08d2e94365676669a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=how+to+write+a+love+letter+to+your+best+friend PDF link annotation
    • http://sportsgarten.com/editorData/file/sefewalejoj.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/26342199292.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/rikodaluk.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/sijuxuxorowonudepilef.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/vusiravejis.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/18934146552.pdfIn PDF document text
    • http://kechengchem.com/upload/files/89317464940.pdfIn PDF document text
    • https://fptica.ru/images/file/79771610492.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/93479777004.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/nakuxi.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/wepixomabamulo.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/zijupo.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/29021827723.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210918_3870396722DF5A5D.pdfIn PDF document text
    • http://xtra360.net/campannas/file/74519270791.pdfIn PDF document text
    • https://profm.hu/files/file/97242723306.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/lufuzabemegamafijoduwad.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/50jqs3jpql7s3ftlkjq8aksolm/13124843548.pdfIn PDF document text
    • https://simorgh.it/uploads/file/suditetavimogoron.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/38699473309.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/8323179976.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/fisitemuduzizenataruxe.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/68684213.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_off0000b093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB093 10844 bytes
SHA-256: 3a437647e17ae04c25be27e70dac6a757a34779ea6ca5719e6766a132fb74e92
font_01_sfnt_off0000c9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C1 15776 bytes
SHA-256: 41afd12356c4c050869777bdc79a6224b98e9706dc7b0160ba7a648b1e02157b
font_02_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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