Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb379662ffe24594…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 02:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fbd2ec5632193669ef637db6b0045dc7 SHA-1: 7491a8c24fa2499bdb4786cfded63a9680a48796 SHA-256: eb379662ffe24594b330472f2cbfbaa9865d2581666e422b06504843f9dba930
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external sites, suggesting a phishing or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://bastola.org/userfiles/file/jilivonabotijugakazuwobux.pdf In PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/19726992792.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/lepotokuzizenimilexow.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/33570339254.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/kojoramix.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210910_2D760606679ADBE2.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/15901326267.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/legezoko.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/4161967695.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/xuvozenuwuzodejazukadever.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/648f3ec4422912a2ce6cd5cd1e637a37/dukomomowanogegubovoso.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/lunufa.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/lulisunivixopewebonul.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/72697226112.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/naxumatoniwiwokeluf.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/80808803175.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/69016839037.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/jagekebuvuxakuxarivele.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/rikivanizarog.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tujuvakotuzofavip.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/81789169915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+convert+sd+card+to+internal+storagePDF 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_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 18384 bytes
SHA-256: 2ddba2e03b1f2bd1508e3fa17cbdc25b8f782ff02f6ee8da64f728b3265d9044
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 10688 bytes
SHA-256: 19377a3661e82bcf3e22900ba43f93497e0681c563d711c3d0987568547cb292

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