Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2393e8379f94051…

MALICIOUS

PDF

79.3 KB Created: 2021-09-26 06:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0663f7b17ca30e3d7d79e1d94729931b SHA-1: 9e497da80963e0cea418564f910d97562119b35d SHA-256: c2393e8379f940519f2acf00fb50d28d906cd6f3a1ee8c2ef586876778abb69f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to link farms hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of a link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://reklama-v-sochi.com/ckfinder/userfiles/files/91815816834.pdf In PDF document text
    • http://inimtrento.it/userfiles/files/xegewuximewelevuvad.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614074bc92ea6---44645703256.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614439bdd0ff0---5025606742.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/29142824338.pdfIn PDF document text
    • http://temple.mo/userfiles/file/mizorik.pdfIn PDF document text
    • http://bienbao.net/uploads/files/79902260423.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/65739117213.pdfIn PDF document text
    • http://premo.at/userfiles/file/fupujuwasokisimeduxuxanib.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/kovepiv.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109101004248422.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/76079320243.pdfIn PDF document text
    • http://cecev.com/stockages/files/ritakefaxuxoludupizet.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/savopivejakabamivixe.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/42936554458.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/67241162408.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/91493544333.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/30883401515.pdfIn PDF document text
    • http://eva.am/files/963f7fa9847762d1.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/75032550564.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/lopofo.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/lubutukufaresogusuguv.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/luniwenobudidodologanam.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/fetilopidabi.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/gitonejefilelono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=aplikasi+twitter+terbaik+untuk+androidPDF link annotation
    • 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_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 15564 bytes
SHA-256: 103d0a7730ece447aed2c3766d963ff251059d9c18ae86865975c6db9ea1b4b1
font_02_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 10784 bytes
SHA-256: 725d53333bbc1f7e9374aba6cade481e468650e9b683765cba1dd497086d486c

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