Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fe5f64d060a67e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 13:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2641a67d9105055bb9a4eed20b59dd1 SHA-1: 54571cc8a2375ba50e4754d1d8642a9f4f3c9ef2 SHA-256: 84fe5f64d060a67e255282b1000f67eeb14426a66f22e92ecf931489e5a1a469
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1c24a2513---50667675478.pdf In PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/15036112546.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/fekipojosoworasujoma.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/47424152810.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/gojivejegi.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/84841039556.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/xafatari.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/rarenedizu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366667635fa---pilopotuxedokijevevorosez.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/92669902519.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/xuxanemutamapuso.pdfIn PDF document text
    • http://donghotam.com/luutru/files/memowos.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/69620464048.pdfIn PDF document text
    • https://basisnomor.com/contents/files/favazifonewazexuradezar.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/397351651.pdfIn PDF document text
    • http://ombs.ru/uploads/files/geforugineriwodidaluzilu.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/79314346909.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/fojak.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/jujetejazemitini.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/82206788952.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/dujipevugixeke.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/59487492693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+apps+pagesPDF 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_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 17512 bytes
SHA-256: e275616c64b5b56ff1050a6d482186d77d53056e949ff2d2e8302d73ff2d1192
font_01_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 10404 bytes
SHA-256: dce8353d393f9f05f3de50803e288afbe27230f85b0ee4a85e85b3c7df4407de
font_02_sfnt_off00012cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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