Malicious PDF — malware analysis report

Static analysis result for SHA-256 db372d0bc5e4eaba…

MALICIOUS

PDF

65.1 KB Created: 2021-09-15 20:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ab48fdeda010606b001b977c43430e6 SHA-1: 2e28ed84fd79713b9c56853da286cdcb34057d80 SHA-256: db372d0bc5e4eaba2670563ab348627b31de153632e17b1184ef8d934b1755d4
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. It contains numerous external URIs, including one pointing to `crewmak.ru`, which is likely used to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crewmak.ru/uplcv?utm_term=ojibwe+language+app+android PDF link annotation
    • http://itagqatar.zajeltel.com/itag/file/files/66135093124.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/5786349327.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161403ccd81204---ruterezemapofemites.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/mewidanidewe.pdfIn PDF document text
    • https://tivicom.vn/upload/files/45379884955.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/82527283556.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/71320726599.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210907141454.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/48282204346.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210914042938.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/rofukinomupijotilikexus.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/gaterogofajitomonufuk.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/pipaxarozuloroze.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/52766728658.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/14024079726.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/wasibebeporukonipufu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f41bc1c586---wuvexug.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/9468691092.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/fimut.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duwotemoxali.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/3856978553.pdfIn PDF document text
    • http://harlit.com/upfiles/file/13476909660In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB511 16580 bytes
SHA-256: 87ef1db89b991a2f0a0bc1bb5fae6d57f9dadb5bd27eadb8c526eff977f94687
font_01_sfnt_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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