Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2e6157243aaa46…

MALICIOUS

PDF

74.0 KB Created: 2021-09-24 00:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: abdc1aa0a4d30eaa190765a57370108e SHA-1: 4a916a7c4c5d8243851840607d4e605f80c0227d SHA-256: 7d2e6157243aaa46ebf0a621cdd0fc4308cfdad9cacdf46485cb7a9fedce6ebf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oalysa.cz/ckfinder/userfiles/files/40733340347.pdf In PDF document text
    • https://hongming-eco.com/userfiles/file/4593343534.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210921131832.pdfIn PDF document text
    • http://skene.es/userfiles/file/17079437932.pdfIn PDF document text
    • https://adikmanis.com/contents/files/wufelo.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/latirebas.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/83096220737.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/68930740763.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/32640735405.pdfIn PDF document text
    • http://bankerz.in/qpic/files/53914356632.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/mikawiwadifudosiliz.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/12237113402.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/92700572844.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/14732249743.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/ketisa.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210903110730.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/34150219079.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/wafixab.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/43586674176.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140b034ad5a6---kowikugono.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/zomawopogo.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/87891732275.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/16348185185.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/batazagenifugebumakuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+itachi+wallpaperPDF 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_off0000c1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 10512 bytes
SHA-256: bcd8d32c8dc3586d3d10d6dae5dafa544c1a915f4ae57f9aebee2c8df854abeb
font_02_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 15904 bytes
SHA-256: 07d99ea1d2e37fd52108f886f7e1437c3af4ff174084ade80066cd6c04fbb259

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