Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd493a1907d2b89…

MALICIOUS

PDF

76.6 KB Created: 2021-09-21 06:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb9fb77af5e567213aacd9c5bb5b61b8 SHA-1: 80afd48c511cbc15a28c76b7b5eb9ed09674fdf2 SHA-256: 3bd493a1907d2b89c5365cbd2dd1e851e03e89b95123a506f41f94cc0e0cf9a0
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 maliciousness. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=adult+game+offline PDF link annotation
    • http://goopenapp.com/uploads/files/pebuganunenorudokuwanut.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/suruf.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/3556207322.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/46838577142.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/78346930727.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/fasozaj.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/nadaborutemok.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/23957270654.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/56618426804.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/73811593371.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/90287302578.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/piwisabuzuzawafofojib.pdfIn PDF document text
    • http://agilesolutions.in/uploads/nakotirisivesex.pdfIn PDF document text
    • http://skncn.com/u/files/jozejubebaforogabilix.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/46765051198.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/33895978434.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/52677409845.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/zosutoku.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/42318015078.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/76528505077.pdfIn PDF document text
    • https://2winit.com/Files/files/61594707226.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/rojewejiroj.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/jodejolazeditoj.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_off0000c8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 10508 bytes
SHA-256: 0530c9582704a7c57d1c23a4897e06199aedb2fe43fe9b806976b620c688fb46
font_02_sfnt_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 17436 bytes
SHA-256: 2f1ee630adf3f6d457cca3730251525e9d196c82cd00dfcae7d2b892c038c2ca

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