Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce79d19ba3e0243…

MALICIOUS

PDF

92.5 KB Created: 2021-10-08 15:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d9f86577f79d65647441e8fb790b3289 SHA-1: cf5c6ab690c4d7e1d8ed3406fdea239218295740 SHA-256: 5ce79d19ba3e0243c067a817172318143017a88939890a35bf29e9070e741485
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the presence of many external URIs suggests a phishing or content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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=indian+law+books+free+download+pdf+in+kannada PDF link annotation
    • http://cristal-in.fr/userfiles/file/rodade.pdfIn PDF document text
    • https://bagstyle.uz/images/file/71009562114.pdfIn PDF document text
    • https://exhibitproplus.net/mentorfinancial/page_images/file/sutodovogog.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/56992438686.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kivubikoganirizin.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jl48r2d8gv9s2lmi4093g5udjp/xonavifulivukiwobosen.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/27906279919.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/mefalisofino.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/jipotewefolowodanegag.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/26587754320.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/buvefaguriwigapabopo.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/17456880310.pdfIn PDF document text
    • http://guowangcable.com/d/files/sinaxubuzad.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202110020357175983.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/70411478081.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/manukiwefozavebulupimewa.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/76262811712.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/31233817612.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/36554627584.pdfIn PDF document text
    • http://poliinc.com/upload/files/41068481056.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/92834856847.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/pamokajijuberube.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/25209083653.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/11557032790.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/21187089536.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_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 22484 bytes
SHA-256: 3a24408f04440544f16bc3f33114b9ae64d69ddc901a1067957d9324d51d47d4
font_01_sfnt_off00013343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13343 10660 bytes
SHA-256: 0382e7f0e6672e862fad4688fbb1673cbdafdfeba99f15ac617cc99260ee7246
font_02_sfnt_off00014b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1