Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbebad77ea2c9509…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 00:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 390b7441c541edaec7a355e162c7c288 SHA-1: 5bb41ca1f8675bad37b82a3e4902e8bb11f18fc4 SHA-256: dbebad77ea2c9509b2ceb5baf876effb401ad6f5fbcaad221686ec5f79905f1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://dajuicebarus.com/uploads/files/90169292381.pdf In PDF document text
    • http://www.elstar.ru/uploads/files/40644176854.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/97083798792.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109051302357865.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rejajime.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/22490377052.pdfIn PDF document text
    • http://csp.hu/editor_up/sotasamuguloridabegimebo.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/muvavelimiroje.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/28634121621.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/suzetukob.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vinanotok.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/74343984377.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/bekexejotenirujo.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/nomigomuwugupekojivut.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d10bd6f54---mizefuretevoxipip.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139271fa77a2---bozabopozigo.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/15778072964.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/viloganeliwiwukavekane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=all+robux+gift+card+pricesPDF link annotation
    • 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_off0000c044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 11012 bytes
SHA-256: ca327c7ce0cf2ad2d9ae87d1b7a3a059bc8ddcab78ebcac1580b351b1136ceea
font_02_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 17376 bytes
SHA-256: 154612792f6cd9655cb74f843f0e203258911a681b7570f47518d060d69aa7c3

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