Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6a810bd45f9558…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 11:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ec6dd7f02744ad44227a361e628ef89a SHA-1: 92b168e34415615773f3582e6a4ed8a0384f0eef SHA-256: db6a810bd45f9558de034d8f06042d5ddc124d6a9b7340ae2e966a50c2335929
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely part of a scheme to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8168

Heuristics 4

  • 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
  • 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://fashionflutters.com/ckfinder/userfiles/files/godopotiv.pdf In PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/sazetubefisiponopefuvu.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/62666036292.pdfIn PDF document text
    • http://seritour.com/rsm/files/50279378996.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/lumebarizatetopetenujimek.pdfIn PDF document text
    • http://dominant.name/userfiles/file/20429649554.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/36674924006.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/pokakiseduto.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210914051056.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/gimejejuvijaz.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/96923090071.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/xavizibiregidunobavo.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/safetuki.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/22003041069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=flutter+sdk+is+not+found+in+specified+locationPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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