Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7f7806713c293a…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 19:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a69e5c3f8af39ae6cd7cc78ed920b5bf SHA-1: 0f0f6e687665b4c092dc6a5b4af9dda9410cee81 SHA-256: da7f7806713c293ad6e3f21c19f10bf9b84d868f66fdf43ed1b402b9198b2fee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ozdoby-betonowe21.pl/Upload/file/gasibupalonuweweku.pdf
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/65613341993.pdf
    • https://rrr71.ru/upload_picture/gikonikodujufuvuxej.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613614b7c53c2---midijagu.pdf
    • http://thegioichuyendong.info/app/webroot/upload/files/69090195863.pdf
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/96993913660.pdf
    • http://skonasystems.com/userfiles/file/pabakagukemivoxaxi.pdf
    • http://p-jtech.com/userData/board/file/riwok.pdf
    • http://thrifty-uy.com/files/others/22220874109.pdf
    • https://bdprescription.com/ci/userfiles/files/teraligexenuda.pdf
    • http://akcihlar.cz/userfiles/file/31599388562.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/o3vjikkgb7k1kalf1sj5ggbp20/26899057316.pdf
    • https://dbmotorbrokers.com/userfiles/file/gadaberatositutafinejuj.pdf
    • https://candbco.com/ckfinder/userfiles/files/xunopokif.pdf
    • http://csc0512.com/userfiles/file/20210914021558_mne08o.pdf
    • https://peoplehelppeople.net/uploads/File/gugivikoke.pdf
    • http://architettogherardi.eu/userfiles/files/19363608448.pdf
    • http://dafangtour.com/fckeditor/userimages/file/rukoxozimoxe.pdf
    • http://niktid.ru/userfiles/file/15093713362.pdf
    • http://baraanduliaptti.org/userfiles/file/saradafedapubil.pdf
    • http://hasyo.net/files/file/romogokimuli.pdf
    • https://duvanco.be/docs/files/10728138959.pdf
    • http://traviet36.com/upload/files/77055705108.pdf
    • http://cmuniontravel.com/userfiles/files/widoroxedezunasukaxofiko.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=javis+artificial+intelligence+pro
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b153.bin
7c84b5794307e16f3ceea5fe921103d4275c649912595a0510de76da588d858e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 10712 bytes
font_01_sfnt_off0000ca12.bin
3c8ae59c78502f94e6e53e53d0cc895926860377c788b7d0e18e2822229ae1ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA12 17572 bytes
font_02_sfnt_off0000f724.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.