Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f293e239efecb7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-23 10:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3fc2f009e5c1fb2bb430a6fd5e3372d8 SHA-1: 24b75cd2403aa1a7833bd3cfc8c17a8179cec78f SHA-256: c1f293e239efecb7fdefc10cdaf14959862abec6b9562953a84fc2cefa1cf437
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to obscure the ultimate destination or distribute malicious content. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://peterpan1996.it/userfiles/files/lojojeb.pdf In PDF document text
    • http://energywork.pl/userfiles/file/vuvofokukaxomijenuvipixe.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/kuvagixosenaveba.pdfIn PDF document text
    • http://dhf-china.com/d/files/selilaxamob.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630770312_2f68ce48fb.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/99717012862.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d098edf36---74277184121.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210911163814.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/85173153793.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/28248249293.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/0khodu0apj263fg7pn6cu6s1ao/rufivejowoxuf.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/40993398353.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/nitamato.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/bipefigusixesasuxiluzo.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/bitifupe.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/tuwibonafit.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/85604843800.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/24134787554.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/kegojibexika.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/39857067866.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/perebinejeg.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/12582172514.pdfIn PDF document text
    • http://divelife.kz/files/file/rarikupipufitudevi.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/69696792670.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/40028108386.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630979902_b4689e1350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ludo+game+android+source+codePDF 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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 17704 bytes
SHA-256: 1fc5a2d2bee294c01a8f61231408b17f73af69efd1d93f90b4a8d8cd88a507fe
font_02_sfnt_off000128ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BA 10624 bytes
SHA-256: 056dc5ba12217f0744111526bd85e173fbddb93860d2dcd70228ab0d1f41305d