Malicious PDF — malware analysis report

Static analysis result for SHA-256 515bd2279da15a6c…

MALICIOUS

PDF

68.1 KB Created: 2021-09-19 02:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e9faadfae144b4834cd1f90869dd5af SHA-1: fce1568c0a86946ecd31de455fd45ab2c32d89b1 SHA-256: 515bd2279da15a6ccda28dd4b06c8cfdb9d005089212d2a30e7da76017b655bc
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, and contains numerous external links. ClamAV and ML classifiers flagged it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://magnettoptan.com/upload/ckfinder/files/9659010753.pdf In PDF document text
    • http://hangnhatbanonline.com/upload/files/71213083220.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/domulepit.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/kipiwimotit.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/vukejipemiremul.pdfIn PDF document text
    • http://freestyler.cz/img/file/luluvekibegizotemiwa.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/nirodamulukurevofap.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/90068454377.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/78216210842.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/zafivumawogefomasorug.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/joraxosetugusesijunewisa.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/muzamajivebit.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/41416590664.pdfIn PDF document text
    • http://apex-architect.ru/images/file/66868755247.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/38091307745.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/jafuva.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/2555609634.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/vaxuzivojatapav.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/roledebefebejazabila.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a2ee8c88af57bdeb5c0fce934779147e/waretiba.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/lanubenuxesizobuvajiji.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/lagozapok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kirby+and+the+amazing+mirror+apkPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/83899424659.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_off0000b02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02A 13664 bytes
SHA-256: 428e56278124b12c50d57893a8eb3e4c74ecb866de1e9f3fb584277752cf6bab
font_01_sfnt_off0000d1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AE 11020 bytes
SHA-256: a6f54bdec281b3013cef0c4e80e53d33e59f947345fe6cd3b2c95ca234b87086
font_02_sfnt_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1