Malicious PDF — malware analysis report

Static analysis result for SHA-256 a209efd1f65b4215…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 23:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 698a25e80afb5878e62c8e42ca7a6602 SHA-1: e18c99c8f27c49dd660cfed21c8870639540bc6f SHA-256: a209efd1f65b42153a79f398d04d503c1c4aecf211dc394425df9307d738aa0b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to link farms hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trevelsi.ru/ckfinder/userfiles/files/sedoxafifelaxuv.pdf In PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/23202276161.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/94592601443.pdfIn PDF document text
    • http://fruitsad.pl/images/file/dasuxezufojoligowe.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/jebime.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/42223025071.pdfIn PDF document text
    • http://koddous.com/userfiles/file/fiwogure.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/zefalaf.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/labegutu.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109041738231718.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/zizodejoviloxep.pdfIn PDF document text
    • https://parfumzone.ro/files/file/84577424054.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/70180978255.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/lotiletevaw.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/mubabapofatuxog.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613257e151c43---18102923352.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/65213762505.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613908cc38b8c---xijolavagex.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/46878543276.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/85795811223.pdfIn PDF document text
    • https://gilbertems.com/videos/file/21105215542.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/silupakowisuvedegexivig.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/nuguxalirukesusurema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+go+teleport+cheatPDF 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_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 10656 bytes
SHA-256: 9241aff55856f970a46bd18db70fee4cb366ac4a9f886ade250c425966495f4c
font_01_sfnt_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 18900 bytes
SHA-256: 3d57b059e7cc29c90de754c29f321f765178de24ea3bc8cc20466e6c28ec23fb