Malicious PDF — malware analysis report

Static analysis result for SHA-256 b414b58663a8f931…

MALICIOUS

PDF

69.5 KB Created: 2021-10-04 02:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: be4e4c5f013fe1aca8f7943f0e4b33c0 SHA-1: 234571c25a10470163efe9aaebf4e4096eb711cc SHA-256: b414b58663a8f931101d8620fa22470633e659cad3c3544579230d3e720aeeba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=look+at+my+body+song PDF link annotation
    • http://wksystems.net/HotelEstimator/userfiles/file/69243709112.pdfIn PDF document text
    • http://gnox.vn/upload/files/68555970705.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/gepafasojexojewewofoxa.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/4478447443.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/xejojegogaxag.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/58538854965.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/23905350780.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/ketazogapazazipaxi.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/1404888005.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/kidafegadedamepo.pdfIn PDF document text
    • https://rubfila.in/files/file/51103029018.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152eb0869679---2641452483.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/mumituxubudofabepigus.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/gafodejimozedamu.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/pinugowosunulewesopuvox.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/76191115699.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/padufuwujisog.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/74735526845.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/90972336512.pdfIn PDF document text
    • http://surausa.com/uploads/files/44832711696.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/75569241321.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/tekazesul.pdfIn PDF document text
    • https://biodez.lt/i/File/17110935166.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_off0000ae69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE69 16488 bytes
SHA-256: 13e7cead1ecd0fff2f166e8053c4c4437b33f080c5bf33b38b4aecd2264f62ae
font_01_sfnt_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 10524 bytes
SHA-256: c73e16e7e42eaa9d0cb90169a2409517e690ec5a6eb72ec1f1782c0feea36d15

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