Malicious PDF — malware analysis report

Static analysis result for SHA-256 551ace4fa45d0d7f…

MALICIOUS

PDF

66.5 KB Created: 2021-09-26 05:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 54fc3c53ca3f5f9c1b74606f4980a22e SHA-1: e9e6d0d4b4734428fb7bc01696d35dcce7c97aba SHA-256: 551ace4fa45d0d7fe52a326c0b38ee8c3fb80bc317f3370a473c80fbfc1fba40
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to disposable domains, with one specific URL identified as a link farm. The PDF's structure and the presence of multiple links suggest an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7921

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://portalpr-b2b.es/img/user//file/_0334561001631819527.pdf In PDF document text
    • http://campbellelectronics.com/uploads/29506283492.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/41845702629.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/83094391420.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/welugifem.pdfIn PDF document text
    • https://ebooksweb.net/files/file/zulimo.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/32804244887.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/linawududafukomaxitak.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/82850895409.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/winekoxubifidevefazolaw.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/36493828942.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/77648533011.pdfIn PDF document text
    • https://dacola.com/upload/files/82027440244.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/87742232610.pdfIn PDF document text
    • http://delve-cr.com/uploads/35491245452.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/41566965481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+law+and+order+svu+online+free+full+episodes+123PDF link annotation
    • 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_off0000a753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA753 17308 bytes
SHA-256: cb2fb396ca5ff13275e71e67a18d4c5eb27835b973bcdbdde27c9d013ab40601
font_01_sfnt_off0000d40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40A 11304 bytes
SHA-256: 5251c73ec4bee5f57748b77e0f1811aa2af18d0eb7e9e00f58d0428686a532ac
font_02_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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