Malicious PDF — malware analysis report

Static analysis result for SHA-256 da37482c4a9fe3ce…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 12:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3b704acb8858a73bfb3506ff4e25f1e6 SHA-1: 4efd028adadd01673045630e661594ada855e62b SHA-256: da37482c4a9fe3cedf845814357ec9a16015415cf04b4062ee35ea15d341150f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to potentially malicious PDF files on disposable domains. The embedded URLs suggest an attempt to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://wastran.ru/uplcv?utm_term=popular+gba+roms PDF link annotation
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/mamuwenimelixetiwin.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/dalulisevimefa.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131907585429---81967415319.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/33749264742.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/rexolozidutexeza.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dac6cd5049---78828265893.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/80756769535.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/31841204082.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/xituwuzokalititavirug.pdfIn PDF document text
    • http://tlcjty.cn/userfiles/aa/file///rulabararametezamowuda.pdfIn PDF document text
    • https://hiroyoung.com/data/files/nogemoj.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/lukigorisofamodexumadafo.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/munitakur.pdfIn PDF document text
    • https://medpressa.ru/files/file/76547711066.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/80631606267.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/98522772297.pdfIn PDF document text
    • https://durimawar.com/contents/files/didunog.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/zupifupametiropadofat.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/29924758617.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/ruponubevawula.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/80960353959.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/miwuvogewoferaw.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_off0000ac78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC78 10408 bytes
SHA-256: 23ae7128eb9639258035e302e611b60bb44a0da52494bb12bc16afe04e18e831
font_01_sfnt_off0000c3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D7 15368 bytes
SHA-256: ad209c22d689d663a33b323344220360d4d5aee6d99a8d369735e975d9f38723
font_02_sfnt_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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