Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d966efeb58312af…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 12:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0525cef2a382ec5857e4236b33ba7a17 SHA-1: 61ba86dfbba3ebeedebc951926b64ecab61ac1a8 SHA-256: 8d966efeb58312af7a8966d7abde87ed8c29859b8ab33256f5bd51f2e242c12b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, suggesting an attempt to distribute or host malicious content. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://icsbc.ru/fuploader/file/rosokopitixa.pdf In PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/45950265606.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210914082350.pdfIn PDF document text
    • http://www.centralperdana.com/file/levowigadot.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091209234573499.pdfIn PDF document text
    • http://ridendo.cz/files/file/80059242582.pdfIn PDF document text
    • http://mobitransjogja.com/files/97985007913.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/2232923963.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/xerexow.pdfIn PDF document text
    • http://protok.pro/upload/files/tegikekexuzopoxuguj.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc85a9e4a0---kawabunasikizovijexi.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/62568824400.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/51121684222.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/lewixifixes.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/jorukojo.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/98619675796.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/vigugisaro.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202198194769386.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/panujig.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/4286565111.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/pidexewikejebalumetadiz.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/80360580211.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9df1b6a05---noxuzivexoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mini+militia+doodle+army+2+hack+version+game+downloadPDF 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_off0000c9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D2 11288 bytes
SHA-256: e8f70ace3decb944847a8f5c17bccb72cdd30e5aebb21267326997a25b4501ed
font_01_sfnt_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 17340 bytes
SHA-256: 9d3e985b026480b28d30f5f633449bb83215036484e5e7e454f2a8167ebd6993