Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac90bed5e4c164d…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 04:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e2a9250c43e88e4d3bfc348b6168ec3 SHA-1: df608b86eee3ea25ad2ee489c4fd6ee6c2c8bb65 SHA-256: cac90bed5e4c164d9f3d78f91caa3425adb86ac408b9a2a7907654521e83ad36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URL 'http://laskod.hu/userfiles/file/ribexepemo.pdf' is a primary indicator of this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laskod.hu/userfiles/file/ribexepemo.pdf In PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/90419633654.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/wefejaxuruw.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_D715ED5C13E7A24A.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/kunozusagokewiju.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/lorurulejomakonixulowid.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/90641421503.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f7745bbdb---91305676807.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210907235903.pdfIn PDF document text
    • http://turatabor.hu/media/jugexikixiresibin.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/tifadelufurowavuto.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/22418663493.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/53959639208.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/ravabotaxugerovideti.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/vasusupek.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/zolidopozamu.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/bapuzutotesaxazageruvomit.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c37e6e44d0ff54da959c92d094e5abd7/xugenibivoru.pdfIn PDF document text
    • http://nova-auto.com/upload/99556185227.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/45456045493.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/wazegixataxazipabaxorak.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/65577503652.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/liwomukopivi.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/2725343981.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gutofizeduxeguxoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=super+free+vpn+apk+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_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 18324 bytes
SHA-256: 6430869f3b87b76ca17144d9dc4c842b44d7e84f9f65d61d1279f58d1e3fb6ca
font_01_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8D 10552 bytes
SHA-256: cb64d56a58d0551dcc2f9ce663f7bca0cddbbd41e7375153b7a1c05b7ea3a866