Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae0878348f052a1…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 10:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 777f5fae377f1f473a0dbe87f3803fdb SHA-1: 3731c5b02f1b2e345d0aa9f2e9f5cd3e40f4ac20 SHA-256: 0ae0878348f052a12c0812c5dfec87ce14de06a6dd611538de6ba35189b9003d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs with UTM parameters further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=how+to+download+snapchat%2B%2B+on+android PDF link annotation
    • http://lamekatus.ee/uploads/ckeditor/files/58709713656.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/razar.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/zoguvekesuwewasedojedix.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/14517374692.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/52911241808.pdfIn PDF document text
    • http://vititanon.com/user_img/files/27893733066.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/49599381933.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/5617715578.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/gokaf.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109020559533803.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/48789330540.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/retokijusarazu.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/95565570196.pdfIn PDF document text
    • https://zagi.hr/files/fugoxebup.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/91163621714.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/91025923259.pdfIn PDF document text
    • http://protok.pro/upload/files/12767311415.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/jefenumir.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/98608564912.pdfIn PDF document text
    • http://thegioioto.store/upload/files/84402103264.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/xawasetexotudazejisolaso.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/losenisesataviju.pdfIn PDF document text
    • https://activepymes.com/pub/file/laroxidusozezole.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/likasijeb.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_off0000d637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 10556 bytes
SHA-256: fc5800a480691a902b2ad7590bf9429f3e295b3ab3ddf5191a8cd4e9e8341aa5
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 16448 bytes
SHA-256: e50c8bb14eee01f4abeee6e42ff40538c38cb654094e2f0d8996c7eafeb174bd
font_02_sfnt_off000118de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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