Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccc28d643a23165…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 10:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2da9c9e29ffbe646ec37f4550afcefbd SHA-1: 4c087fb217980a013e5019e0b22459089fe4feed SHA-256: fccc28d643a2316537ff29a73829f864b6ee395e2be3e1507560e4de1f7962ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=bigg+boss+season+2+winner+telugu PDF link annotation
    • http://sanphamhanquocymy.com/uploads/files/17558392274.pdfIn PDF document text
    • http://101balkon.ru/upload/files/bosuvumagiboli.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/23196556997.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/71969722130.pdfIn PDF document text
    • http://punaide.com/userfiles/files/winovaxozaxovedodolobiget.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/94912256671.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/41027445267.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f88c8db37---85451345050.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/dunizavolaxijoxigunubu.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/xijigupabilidozogixumipaw.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/7256723112.pdfIn PDF document text
    • http://dentistturkey.com/image/files/55990904935.pdfIn PDF document text
    • http://vkts.se/userfiles/file/taveja.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/maviberetelik.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/2274693005.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/bowamagez.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/fosisutosugora.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/69937673320.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/guliwelazozoriw.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/vozodivekuxadudolasofegi.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5da5699f7953cb6e58c0f6d77b587972/lotemiraleged.pdfIn PDF document text
    • http://juncheng.tw/upload/files/49160667915.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/nuleduraketubalotev.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_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 10780 bytes
SHA-256: 87a106e8d7cf27b5c9a88c2aba53d5bf03fd935993fc0607e0b1f4e3d7c31948
font_01_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 17824 bytes
SHA-256: 428fe819b6bff67f6bc605b6fc5ff3f7db7697b46330ca676bd743576c981b34

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