Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0819e2ca351abc…

MALICIOUS

PDF

58.1 KB Created: 2021-09-16 08:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f761f7b8b165a2a530a27f7323db4ce4 SHA-1: 85c732306b1ffd787aedba34f4d72d74140e52f5 SHA-256: cb0819e2ca351abc33aab7bf7b8a257c97023b2f4c3fb1c99110296ccbd04737
124 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The PDF's structure and embedded links suggest an attempt to direct users to a network of sites, likely for malicious purposes such as SEO poisoning or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7930

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://derkwoo.com/upload/editor/files/96380515333.pdf In PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/99318865372.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/96314777968.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/ferilalubexedolef.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/79783237094.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109050826284270.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/96613549004.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/wonurevivixezujarumuva.pdfIn PDF document text
    • http://nincity.de/inline/file/49098235452.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/vadafidejidivalosudonaxex.pdfIn PDF document text
    • http://cpils.com/userfiles/file/nelusukowemozob.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/31946782932.pdfIn PDF document text
    • http://drironcat.com/images/file/dakifaru.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/sezutetulubejenizesesi.pdfIn PDF document text
    • https://questyme.com/userfiles/file/wumope.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/93954092844.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///xepokevebet.pdfIn PDF document text
    • https://redac.ch/upload/11530055670.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210908122224.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/36956551115.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/kupib.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/59364841597.pdfIn PDF document text
    • https://tpk-m.ru/files/file/depexalegejijajed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=postal+code+san+fernando+pampangaPDF 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_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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