Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa1cdd1862c7aae…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 06:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 659e23e4e4f95a287e2cd109fccc5783 SHA-1: a5b6c1deb96b528e0f7898fd73ecf111556a9199 SHA-256: 5aa1cdd1862c7aaecec85ac1b71ede30bd6c20efde86e3e73ffe18dfc58d47bd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to external domains, many of which are associated with link farms and disposable hosting. The ClamAV detection and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure indicates a malicious document intended for distribution via email attachments.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4649

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 https://philabc.ru/uplcv?utm_term=best+game+for+android+apk PDF link annotation
    • http://www.schule.havonix.com/ckfinder/userfiles/files/23950065467.pdfIn PDF document text
    • http://clingac.com/d/files/pevowagizifodabases.pdfIn PDF document text
    • http://erpos.sk/data/files/zakutovuwep.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/40844651386.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bixekotirifafin.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/gawaxumexevuketalatate.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/42338716236.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/gupagem.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/gubowoguxuzipejobokeseren.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b35c4b562---15671074438.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/88572040462.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/woxupojokadukupelemazo.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/64675975448.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210907183552.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/75967522284.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210903_7824f.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/jejejoxofafudexinokuv.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/94168959480.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/82576096100.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/31656892919.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/givarajakeru.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/zirover.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613058fbe3019---zepub.pdfIn PDF document text
    • 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_off0000b072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 10940 bytes
SHA-256: 340f1d05dca6da606618fd94acee58a07982022443304b01979e846c6e893bd6
font_02_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 17760 bytes
SHA-256: b3191fa1d2aeec5d192f930b040a1030d65b9b52d7467c12b4ea8e0c47946a31

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