Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efd9f3ea74169a4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 03:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a838902b89d97e72e5749d9915eb56c SHA-1: 7967b6947ceb6047f55725f422327eff80a9b59f SHA-256: 7efd9f3ea74169a49f3af60d4c2ab03a95d70a8a6caeb862572269d06f5655e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs pointing to external sites, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gemicilojistik.com/userfiles/upload/file/3257041199.pdf In PDF document text
    • http://fxmeat.com/upload/file/9f6778243d2aadd0da74f61b6483d7c7.pdfIn PDF document text
    • http://dogable.de/userfiles/file/59167572382.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/68777703354.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/gaxivenurudisakerexetod.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/3490073094.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/12059368880.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/mixodejevowixajapikos.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/pimuwuduvojajotojizat.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/49237634633.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/34607495479.pdfIn PDF document text
    • https://songhong.info/userfiles/file/60171458223.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/vipinenirevejonesokeles.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/85596593675.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/34527929964.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/94372733734.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142656e4cc16---14841904418.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/38538198312.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/mofukunagozogenemolesow.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/41321219807.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/21143809413.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/c8cf608484a82956b267779cdde27dd0/67602967350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+android+thermometer+appPDF 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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 17040 bytes
SHA-256: bed45e8b207a2137fb4352e229781fffc346c7aca8c784d771d5a4838ecfa690
font_02_sfnt_off00011f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 10664 bytes
SHA-256: ab3442f5d6ce491169373a00039fd7ec14a388cc15c4b4fc246b0eb2b0311c4a

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