Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2ea266c56f455e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 18:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6133e03fa3e6d3abda65283178b687cc SHA-1: c0c9ac06637247e82ff64783c41973c2d224873e SHA-256: 4e2ea266c56f455eed65f6dcb0d8c7d07cee55d24afa63782959f6194e785889
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs and is structured as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=how+to+do+a+factory+reset+on+android PDF link annotation
    • https://salvatoredivilio.it/userfiles/file/jefodeluf.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/27899533845.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/50839129270.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/zedukixalaxirijezaxutowom.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/vevusasot.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/46068896401.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/7685204433.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/tajawe.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021971638255462.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/satajimux.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/tudikisanuwisekowe.pdfIn PDF document text
    • https://digireg.ch/upload/32216501205.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/34418224143.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/wagixo.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/gejeliz.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/28927794843.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12f81679c---18187021098.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/xawutabomevulu.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/38969753467.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613df7420848f---69998443140.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/setegovov.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/muwevivebejufep.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/ranakidikegeka.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/jutivizojafe.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/bokubogelob.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_off0000d096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD096 18232 bytes
SHA-256: a83163b1628b337c998fd8bee4e79f1ac9acbc7d6f5b60fa39a0ccf63cab443f
font_01_sfnt_off0000ff60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 10616 bytes
SHA-256: ce33deec75b71f037a9eaaf77b2a6a98efd582d7ca4b35c4232355b67dcdea3a

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