Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b2f36c0ae9d11b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 05:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7a2bb6e8c41bb2f95325b4ffaacf96b SHA-1: 55c10587b60a5481acb3d0e9d5c9981dc7409cce SHA-256: f0b2f36c0ae9d11b1d2f09dbf3b336afef925c0dd7e0c7bf9d8f69c5d42bfad3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URL 'https://coretry.ru/uplcv?utm_term=ufc+undisputed+ppsspp+android+download' suggests a lure related to software downloads, likely leading to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://coretry.ru/uplcv?utm_term=ufc+undisputed+ppsspp+android+download
    • http://cementfeet.com/userfiles/file/76057882261.pdf
    • http://theponghop.com/upload/files/23629503917.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301df24a880---kupemavevinemarapimij.pdf
    • http://bigdoughpizza.com/uploads/files/22903359784.pdf
    • http://axiomestates.com/userfiles/file/46554042720.pdf
    • https://alohasafaris.com/files/vedurolej.pdf
    • http://herium.net/FileData/ckfinder/files/20210911_EF6083F0463763C3.pdf
    • https://0286869143.com/editor_images/files/nigutofewelaja.pdf
    • http://innovad-ltd.com/userfiles/file/zerugitijoku.pdf
    • http://cariboohose.com/userfiles/file/90171982588.pdf
    • http://massimosusto.eu/userfiles/files/93418874836.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413cfce5325---nilulidefovidesenax.pdf
    • http://nhagiatxanh.com/public/default/ckeditor/files/mamovijukud.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/48092284475.pdf
    • https://samsungdvm.net/upload/ckfinder/files/63904726902.pdf
    • http://pickup-ws.com/userfiles/files/84846899939.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/zulurevapimugefonagiz.pdf
    • http://fashionflutters.com/ckfinder/userfiles/files/40053630178.pdf
    • http://ort168.com/upload/ckeditor/files/64038354296.pdf
    • http://roseeskin.com/userfiles/file/20210913142632.pdf
    • http://parzenica-bialka.pl/userfiles/files/xuzasudoza.pdf
    • http://klenderbio.com/upload/files/3269373175.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/44695208409.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_off0000cbdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 16792 bytes
font_01_sfnt_off0000e3f1.bin
4626346fa979a4381d179712c47e7e74f7431d0f835c0a021875eeaa88456678
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 17948 bytes
font_02_sfnt_off00011285.bin
44e3cdf4d9ceb6ea2ea025d963f6f190718bd876e14f174823f8f9742cf288f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11285 10808 bytes