Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5d8ff1904cf65d…

MALICIOUS

PDF

67.1 KB Created: 2021-10-04 05:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b1a7e4365e2adf3ca2132d4477f905c SHA-1: f556fb085da7eec17b2cfc5ee0471541c20a662e SHA-256: de5d8ff1904cf65d6df5523fe6ab1ea637266c2e4559a39a70239b7f880e3caf
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 users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to download further payloads. The presence of embedded JS points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5435

Heuristics 6

  • 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.
  • 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 https://laborke.ru/uplcv?utm_term=the+shredded+chef+recipes PDF link annotation
    • https://mayxaydungthienlong.com/uploads/files/files/vofimiropusa.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/48830835521.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/nabozesawavitenedegud.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/gowizenibediwuxedepuro.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/kebugobikiberifefigonigaw.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/79703509424.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/rowinelegidilumed.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/tuwoteve.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/96519483162.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b867e26efe---kexurunelu.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/31246598216.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/bovawubefenefilop.pdfIn PDF document text
    • http://vodova51-53.cz/files/9709769649.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/japafeweparopiw.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/99994161138.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/mafipeforuwadekiz.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151b610016e0---vonotigodofaxu.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/tukawogabuxewusuxes.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/vodof.pdfIn PDF document text
    • http://parentini.it/userfiles/files/bisigunuwasik.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16327702854843.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_off0000ae4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65D 17120 bytes
SHA-256: c32e21d929aef0e80d6a65aba0858ab0683dc1b4580590a7ba814777cace92fa
font_02_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 10152 bytes
SHA-256: 8a6ea6f08b60eb49a890ba53542108d28074ac155c12b5f1a70a91c2535c6f8e

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