Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fca1931e5c35ea…

MALICIOUS

PDF

74.7 KB Created: 2021-09-10 00:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: f4f43d023cf54db5800229b125692f5b SHA-1: 71addac1915874eaee0f909b7091b41408258228 SHA-256: 75fca1931e5c35ead1759a44e996d6529e7fd8bf345997d28cb00dc28f76da7b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/66272863962.pdf In PDF document text
    • http://ceramkgres.ru/userfiles/file/56707393195.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/welipaf.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/15800489754.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/movupi.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/tafimanojenizipuloxizaked.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/vowakikimajakaxugubozuz.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5301744467.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/98811364957.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/52205671500.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/34128398164.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/xujararezijujonarudipe.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/28934627554.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/10917209728.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/takijovarurowalibom.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/jazufotop.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/lidabojo.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/nomasixodelegogofatiz.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/mekigatebelazolud.pdfIn PDF document text
    • http://fkhd.cz/data/img/54022019976.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161304750b6145---dosatanonefubo.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/64553584872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=esp+for+pubg+krPDF 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_off0000c240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 17564 bytes
SHA-256: 43b960e873d8ebad652a9ce73d44b8371b281cdf6fe6e835d64f83b6c54235cf
font_02_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 10216 bytes
SHA-256: 888831fe49ee93878085fddcaef348074049a77326794bfca5666b685d8679a6

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