Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bc86f2cc8b434c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 06:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6796dd965a3c51f39d63542fa76fda08 SHA-1: a9845a4ef2ec91982468ce27503d9d796a9e28cb SHA-256: 01bc86f2cc8b434cd6d584f4e6fe5b04ec3d4de9adda4e3a10f4e00d87549158
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=after+full+movie+online+free+123movies
    • http://malifer.hu/upload/file/zuzejelenijafajexikot.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/xubibupugenerovidu.pdf
    • http://kyanite.tv/userfiles/file/51074713196.pdf
    • https://krantiservice.com/ckfinder/userfiles/files/xakegavujekuxewoso.pdf
    • http://pegastelco.com/pictures/files/41274090107.pdf
    • http://ls12368.com/userfiles/file/vasudi.pdf
    • https://ipekyolumedya.com/resim_galeri/file/23907291868.pdf
    • http://www.themixchange.com/userfiles/files/dofirelupikupaxorezanafod.pdf
    • https://karpataljaturizmus.hu/upload/nuropivijefawuwudorode.pdf
    • https://kitapkapla.com/upload/ckfinder/files/dizonu.pdf
    • http://geombiagioschettino.eu/userfiles/files/63584820989.pdf
    • http://driver-jazda.pl/upload/file/xijipasafezodemebutigo.pdf
    • http://www.dkmodels.net/ckfinder/userfiles/files/sudupajumigonav.pdf
    • http://uforoi.com/app/webroot/uploads/files/2591671628.pdf
    • https://mmtours.si/uploads/laxipekakojifugozewejaz.pdf
    • https://eravukappalpalli.com/userfiles/file/fusiritenopif.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/74abd3a47446db83a42887ff73980445/guxekulexetuxekubeduxi.pdf
    • http://fratellilongoni.com/userfiles/files/13993480650.pdf
    • https://dalton-english.com/userfiles/file/47562736525.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170e2c4b41---fapux.pdf
    • http://phunphu.com/userfiles/file/29184591701.pdf
    • https://remini.hu/userfiles/file/zipiwel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d0.bin
7b915d6f006bd8ada5730613ab3a27c708e70a430b0ffde8f6b694b507cfbe5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 10704 bytes
font_01_sfnt_off0000ee89.bin
e2269fa7ea99a139cac55aef6b1d5ec1445283b1e2a512144386aa017d01f798		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 17344 bytes
font_02_sfnt_off00011b0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 16792 bytes

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