Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffaf48412cca5ca…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 12:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7135313d580d1d5c37fee2edfb7e514c SHA-1: a4164b30e3563c6a4ac5ecd0e0734fc04d3108f6 SHA-256: dffaf48412cca5ca5cd5b4116c7fea21ebbe25213df02992250c69cf5c699e4c
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 the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001 (Spearphishing Attachment).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=fmovies+free+online+movie+streaming+sites PDF link annotation
    • https://hospvetcentral.pt/site/upload/file/7506258448.pdfIn PDF document text
    • http://marketingnews.fr/images/file/jufaluvususuxe.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/75944489318.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2e103b8c305ebf3c283b6b4a8c9f55ce/zuxitosevunojob.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/togemipote.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/kozusifafiwafiga.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/2980046690.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bevuxinameparemu.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/18279631423.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/35984057257.pdfIn PDF document text
    • http://parentini.it/userfiles/files/86498225983.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/mevugisudoze.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/24508696551.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210916101843.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/binudopujutibile.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/49679414435.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/vebozamapamilezixot.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/47511648365.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/79096725452.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d26aafd52---ziwoxeduxafe.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/bofurogi.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/29351353096.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/dumitoxuwak.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_off0000d6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 10600 bytes
SHA-256: 1d2f25d9c4edd3bc3cfb25c87a0a8184fc5551658a0e19999ce17521928e9f50
font_01_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 17272 bytes
SHA-256: 568e393122fce822f9de32eac799a61efbdb1ffaf8c6b157b38f10820150fefb
font_02_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1