Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5b339dc4c41493…

MALICIOUS

PDF

97.5 KB Created: 2021-09-17 20:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e508586b4c11e7c91ed149f4ac144310 SHA-1: e5ff8d37f67788cac5a9f1833a8745f6874d27c5 SHA-256: 6c5b339dc4c41493f357ef14c03960a85a1d5885a5de7ffe991464b9d4ed7586
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and appears to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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 https://smidgel.ru/uplcv?utm_term=como+actualizar+android+tablet+china PDF link annotation
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141396337bba---jisavanemikaminodaf.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/benatob.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/22364025708.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/56651236180.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/vamiroraj.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tevutozu.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/femefozibopejemuganuvuju.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/begodujivekirobe.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/rakutilibeke.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/73312226549.pdfIn PDF document text
    • http://www.bash.cl/media/file/45661125741.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/wogaxuladazedi.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/27546968998.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/tipifitarofavidavelejov.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/77479276818.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/bakimuvedoxawewetuzo.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/60423088820.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/sotapizupaxoxigarej.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/68728398682.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/93dkg47qj3lii27f6o52kulciq/29158477382.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/naloposagevutamafaped.pdfIn PDF document text
    • http://haphadoor.com/upload/files/tunametunezibukazori.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/muludorewunipisijusowo.pdfIn PDF document text
    • 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_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 10800 bytes
SHA-256: 26547a5adad2561fb8a0c89a50823300eeebb8e89b9246a7e9029f81de51415e
font_01_sfnt_off00012ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D8 18948 bytes
SHA-256: 0bcc147312fe5faab0ded11a615ecb6d4b19ee3a52f660e63e23643952b838c9

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