Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6e2c82ed9aab7b…

MALICIOUS

PDF

101.5 KB Created: 2021-09-09 12:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0dbcc4147fbff0de539738b6b2ce2b6d SHA-1: 94de749ebd2f08d0d41bb333eed7360c579f72ac SHA-256: 9b6e2c82ed9aab7bc1fa78ee4a0dde373db250bd0dc329399331d23e5378c32e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, with numerous embedded URLs pointing to potentially malicious content. The presence of external URIs and the link farm characteristic suggest the document is designed to redirect users to attacker-controlled sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://smidgel.ru/uplcv?utm_term=intellectual+property+rights+in+india+virendra+kumar+ahuja PDF link annotation
    • http://ambvetsanprospero.eu/userfiles/files/26275875443.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/77121314269.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vavej.pdfIn PDF document text
    • https://hojoairport.com/images/file/84159222635.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210904130459.pdfIn PDF document text
    • http://peterdegendt.be/file/61604349150.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/58027748873.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/70891022294.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/lusetabofuxesibiji.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/tizisagezoxop.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/deginanoranijuliji.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/6815875195.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/mubazewuwanizurizexase.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/29891610822.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/vunorurozojivi.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/17008731538.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902221824312.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/fuwinefakep.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/tibaxomusonimif.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/58447198728.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/pimeb.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/9709489912.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/12136975230.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/loradopibulagilutozavuno.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/4025798808.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_off000123c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD9 11412 bytes
SHA-256: 7110cacfa6d8b8a589324a4b845e4e6ebddc02baff18c2f83714562c655b9560
font_02_sfnt_off00015663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15663 19172 bytes
SHA-256: 78661c72a4b37f75d38157f52dfc4101c9ce08f1e79bda2c2e164e965dcec947