Malicious PDF — malware analysis report

Static analysis result for SHA-256 003d4c7ea4e683b6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-23 13:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3e7a7690aedd2e1e85f170b28eced1b SHA-1: 9595c9ffde5fe6fc906e3332bd17ad58eed94f13 SHA-256: 003d4c7ea4e683b6cb42b5acc39fe750b6a2284ee8b1b44bafe4958b2dbc582c
146 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. Heuristics indicate it functions as a link farm with numerous external URIs, many hosted on potentially disposable domains. The document body is heavily obfuscated, but the presence of multiple embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://studioaeditecne.it/userfiles/file/6894562344.pdf In PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/40140734800.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/pifawifulamizoso.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/zovoganejebawidixemopo.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/23982986952.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/67688346899.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/6980734187.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/tuxewepobanojojuromolup.pdfIn PDF document text
    • http://feg.vn/uploads/files/feripefuxupoxeza.pdfIn PDF document text
    • https://5uempat.com/contents/files/78180498999.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/derujuneminupatikusex.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/17958552526.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/pupivepava.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/jitanoxisipilovonebe.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/41417324584.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/kubofeburegux.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109031212346753.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/gixerurimasedotadugenedam.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/bimudikapo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ba0b3e93---belizobidosari.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/rebobur.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210902_1E5390F48C53ECFE.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=boox+assistant+iosPDF 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_off0000b96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 9980 bytes
SHA-256: 1eede491456b585f7095e4dad546cc93f320e5af012b8d63d5ade5e34d5e4e4b
font_02_sfnt_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 22116 bytes
SHA-256: 150a8e529d2b9612240cd67d1a8845335020ba263051bb8d3941aaf4b3b766e1

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