Malicious PDF — malware analysis report

Static analysis result for SHA-256 93727df48347e557…

MALICIOUS

PDF

73.6 KB Created: 2021-09-24 01:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d48d3a0166c4df3cde87d2997d9eb42 SHA-1: 047af405d809394e6d11d3faaa18a9cefbd8f8a7 SHA-256: 93727df48347e55756c8db782a7503b00f1c20e07fd37d7cbf0d41b884e7af01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded links, many of which are on disposable hosting and utilize UTM parameters, strongly suggesting a phishing or link-farming campaign. The PDF structure and embedded URIs indicate an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=mod+nautical+life PDF link annotation
    • http://colorfusion.us/admin/images/file/sotapizupaxoxigarej.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/17619815761.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/2212705894.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bakalabiviwifasigiruno.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/nezubujebivufut.pdfIn PDF document text
    • http://samtekelektrik.com/files/vakikulafasi.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/95532071364.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/tigifiwuwulasiburede.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/vilexowivujowubulujimu.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/25425349003.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/dugifezozirorovewa.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/gamoxipepe.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/jafuwasegarikufu.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/noremitepenakotog.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/43173590521.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/20467512161.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/88883881838.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/94513212884.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/kezibenim.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/wujototuwiwogewalomezes.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/gefobigutijod.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/33870191396.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/63282677835.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_off0000bda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA0 17252 bytes
SHA-256: dd4111c43818dbe26f39a2e6404e3f09466832d2e1346a87eebec6066d7d2dc5
font_01_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 10296 bytes
SHA-256: 1ef2715b93b5d186c0573ce0aebf58904b7e38bd6eb8dd37a2b82ba7b186de7f

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