Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff815bffd9fbdb65…

MALICIOUS

PDF

73.4 KB Created: 2021-09-21 22:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f3c57f301813dab75d164026a2e6fc98 SHA-1: ec3a77f4811c9a0a498f80bdb393dc0fa44757b0 SHA-256: ff815bffd9fbdb6533d2c8eafa0d1a2fc18f06d43f0ffa121a88abb0a43792b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to external PDF files. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7417

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://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/97670419602.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613703005fa54---21507513574.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/40087194073.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/90220338743.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/fozadugevenopigux.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95017163680.pdfIn PDF document text
    • http://saint-party.com/media/file/voxof.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/49362843905.pdfIn PDF document text
    • https://eclearusa.com/images/file/37606419579.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/25275481951.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161398f9778324---8859284687.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/73609332977.pdfIn PDF document text
    • https://airxps.com/userfiles/files/patumawefifoxikilibuf.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/togosulujaxot.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/zisewamuri.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/83384801154.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/letirubizuzalotufiteb.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zejokuxurenewusuwuv.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/39392093831.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/77553401325.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/79722527430.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/17659789605.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/140056455306.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/rolinivoniriletori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=coc+free+apkPDF 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_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 16520 bytes
SHA-256: 5270e5b832725741324f18d9f491ba8ef68d5b993acb0a20914651cd5a7faaa5
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 10088 bytes
SHA-256: 337d7b373badbc4f88e163f87201b18c8bea1cbf80168f0bbf903c2e252136fc

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