Malicious PDF — malware analysis report

Static analysis result for SHA-256 565b0de4acb77c47…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 23:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e42770607a470a8cd5dc94090c21f50 SHA-1: 2a1a15d2b8b3ae1580b3650294c644113dc44314 SHA-256: 565b0de4acb77c47c401fb62efbdec97bfd7040f8a5c980198313df18eaf8aa3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also includes numerous external URLs, some of which are hosted on potentially disposable domains, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://laarakkers.com/ckfinder/userfiles/files/sidufudexevajokulorota.pdf In PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/39080378953.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/namubufi.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/gosisinudafobafodor.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f91b80ab08---gakanetujubaso.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/gipobamojedekulipizan.pdfIn PDF document text
    • https://senegal4d.com/contents/files/womuremipuxelir.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/44643864004.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/76670153330.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/jabazexedujopefak.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/79458195083.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/senigawexuxabaga.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/23588035442.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/ruveg.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210914_1B7B6B1CCE2D4D08.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/zokadexukotukafabitafu.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vojekonezufukarozorutenof.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/79441115496.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff700939e0---43466986129.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/tetalidewizixuxagifixaku.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109031219541503.pdfIn PDF document text
    • http://hbaoge.com/upload/files/bezaregelep.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/nibuvapurariwibaduju.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/tawujaxe.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/98768210161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=convert+wma+to+mp4+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 18304 bytes
SHA-256: f3e97470719bade523052e1a103061f99da64acac581ca2cbff328832696336c
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 10508 bytes
SHA-256: 41a0c8ec7cd8350c13779befd70d6231d2a2bcbcebe73a2d1ded061dec6bc872
font_02_sfnt_off0001219e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1