Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4adb5bc87abd1a…

MALICIOUS

PDF

90.6 KB Created: 2021-09-12 20:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 73d0a169133f2018cd7afb1fdd4c042b SHA-1: 8e871d56c4908622178ca494811e3a591b9c656d SHA-256: 4f4adb5bc87abd1ab60a0787f751c3c8e2cbaad792d0cb09471a67066054d632
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

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 http://hitelesen.com/userfiles/file/pidezaji.pdf In PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/ruvobogomewowekupukaveg.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161318e890fc36---3022973835.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/kowixinilowaf.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/ritererojape.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/36862644211.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/29425956606.pdfIn PDF document text
    • https://hoavily.com/uploads/files/46023666291.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/tunidokefipanosotuzebu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/34800955775.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kibevolabetuwosamemi.pdfIn PDF document text
    • https://premium-house.uz/images/file/81085227864.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/58840096731.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/wadina.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c9c17f2bacadfd547fa19b20388fd4d6/tuwafo.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/98736595150.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/50492867338.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/gifetiladawu.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/63551491155.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/69617611999.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/wozazunavakegagobufoxu.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/13158328749.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/90534943279.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/49302778166.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/kowesopitoxovudoreru.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/59258884250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+delete+gmail+app+on+androidPDF 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_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11447 10644 bytes
SHA-256: 3500837088569854d76340e18d9f5e6fd7c7a63bc1fd28c7b2227ab1613d54f4
font_02_sfnt_off00012c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 18472 bytes
SHA-256: 143e796ba7b572eba1083755445471beabbf693aa4e48534b7cc6b40942d2190

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