Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9024e4c19304ad4…

MALICIOUS

PDF

91.0 KB Created: 2021-09-08 23:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d2310610b8439b61b9ecad1bcbbb5c12 SHA-1: acb897c37c504cc4d6f99d5f0557fb46e7e11182 SHA-256: e9024e4c19304ad49364e4e2da8fdc1f0fd10e396ab0dceb730f7c16dda32b5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://themalc.org/files/file/5713192169.pdf In PDF document text
    • http://www.og2c.com/images/file/zudewe.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/domimixibewivugad.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/87494568275.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219273744375.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///sasadale.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/29485039169.pdfIn PDF document text
    • http://iknow.pl/files/file/35967404517.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/wozizeminobomuwatopema.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/takobudupate.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/2370769595.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/lerijabaretigefodapezoz.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/zajobavatidule.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/82951000066.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/37210002255.pdfIn PDF document text
    • https://papiratisk.cz/soubory/12040848392.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/joreriwuvefowokesubufa.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/71230578131.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/jiwoxiluvulagafakiki.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/kowizotusi.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/jeminitorawave.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/47257588809.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109020138267572.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/kojoxegodezumanol.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2e825005---92189906960.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/mepesiwizikukimaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+best+gun+in+advanced+warfarePDF 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_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 17580 bytes
SHA-256: 30399be4db5ee7e2b0d215b59c6d43acfa92a1ab6ef95a5cc8bf924257425e4e
font_01_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 10972 bytes
SHA-256: 3290b22aab5a1ff073d0004614ecdd2153ff43c5276e9da991396d78bfc8ed7a
font_02_sfnt_off000145a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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