Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59d40af827eb0d3…

MALICIOUS

PDF

121.3 KB Created: 2021-09-12 23:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4e4c562316b083c66b393a9475f55b72 SHA-1: 05201884ebf19ddf241b28cf2db6f317f89ac60b SHA-256: a59d40af827eb0d3edb488cf37882c615ba01be01b398a5f5458d110e8891a44
124 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. The primary lure appears to be offering a free download for 'Garry's Mod' via a Google feed proxy URL, which redirects to one of the malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9242

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://burmeseburmilla-allevamento.com/userfiles/files/gazared.pdf In PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210911_025932.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/devularepetirewofamizapi.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/8933318475.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/navibovegidevunoxal.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/pivimuz.pdfIn PDF document text
    • https://drlanda.hu/user/file/62646062931.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/tokovadijejoxutasapu.pdfIn PDF document text
    • https://sapporopools.com/contents/files/vuduzanonemajene.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/10635050687.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e79kfqmb2qtlq3j3ieg1gvuuu3/lonunukoguleloxigibose.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/dunudufuwinevumeki.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/52490538736.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/59589621054.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/45093046566.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/rewubeledu.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/kutomajopuvuzawap.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/431623946.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356a9d5b5cd---gasajofowekux.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/259519745.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/turiboni.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/kozivanadedurapuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=garry%27s+mod+free+download+pc+with+multiplayerPDF 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_off0001aa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA25 19728 bytes
SHA-256: d0427e661c9d7554bc5589d3853254cf11392ff0aa90b60bc546ea5fdd022a2c

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