Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa21c447f758aab3…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 13:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 381903d7cc270809700a8cbdba7cae0c SHA-1: 4ce3729781e327184d2c5d8118a4d5a2d8375f1a SHA-256: fa21c447f758aab3b1e0d7d94ac37f607fec126faafe6b82fde911b56c35f304
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. It contains numerous embedded URLs, with one specifically pointing to a site offering cheats for 'shadow fight 2', suggesting a phishing or malware distribution lure. The PDF's structure and numerous links to disposable hosting further support its role as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=shadow+fight+2+hack+gems+and+coins+cheat PDF link annotation
    • http://mirai-kankyo.com/userfiles/files/37043908646.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///xozaduvazixokor.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210910231520.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/94428400638.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/32003265533.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/xawaduvixemutivimigavegem.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/mazexizikakimasemetav.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/9435738370.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/pabezovopixagufabepeb.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/83867970055.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/tefesegisomada.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/tarezevawizajenipuparejir.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/22915747059.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/woteraxixekexoporuli.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/83948694078.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/ridajifopezedimewibawam.pdfIn PDF document text
    • http://climtech.com/files/files/pevokow.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vufoqefpta0hr185juskte08ei/70386988822.pdfIn PDF document text
    • http://vhz.cz/user-files/4235505859.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/joliporagoraritotusok.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/83216584040.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/nokagulagozebesixiguvitof.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109111148545388.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_off0000b1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AC 11148 bytes
SHA-256: f1586fce03f467be5da12f3ca56bad79e56fd89a73531d1de2a4c7968834b56d
font_01_sfnt_off0000cb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 14676 bytes
SHA-256: bf862d7135fe72d7643bd1d1b8983fb66d1317b31781a456b1ced2c8a4fa9991
font_02_sfnt_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1