Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61a4a7763ef3052…

MALICIOUS

PDF

72.4 KB Created: 2021-09-13 04:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acbf41c48ba2aead9a224f36182b8e15 SHA-1: e8bf161a4ae98202d1a61ed71d6c94b8ac239dba SHA-256: c61a4a7763ef30521db866811d792b6a5a263ce6d190209fe2175d520cec2ca3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JS points to T1059.007, and the overall nature of the file suggests it was delivered as an attachment, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7417

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://daisytalavera.com/userfiles/files/9393941329.pdf In PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92e50def2---47020017163.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/gememojegidigowa.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/3914935059.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210904201024.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/kiserezawitewa.pdfIn PDF document text
    • https://onlinendttraining.com/files/11318254343.pdfIn PDF document text
    • http://wamer.org/userfiles/file/gezamudap.pdfIn PDF document text
    • http://klaaswester.nl/img/file/vawusurudasupavovet.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/bewupuve.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/86510461811.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631046075_69fa902d7c.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/21874939407.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/koxoda.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e919d08036---guwutew.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/52756262026.pdfIn PDF document text
    • http://ruihuitax.com/files/file/lefovipewob.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/52867647134.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/73406988547.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/bujituwik.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/waditeru.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/jemajuresozomisap.pdfIn PDF document text
    • http://suaups.net/userfiles/file/47983586736.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/revobevusopubodut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=auto+start+app+android+tvPDF 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_off0000c33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 16768 bytes
SHA-256: e2f306704cfee87895a4dd08a63eb446c6ed4b0f5c292987af3cf40b07c43e7a
font_02_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 10356 bytes
SHA-256: a7179af80e92f75eb55c383f875125649f349c6c626fa6503cefaf983690341f

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