Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8c285636468e4c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 14:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8040d0a3be2a73ce225c617b4830c720 SHA-1: 7f5953db0a919449ee0cb4ceccb49108690a8b4a SHA-256: 6a8c285636468e4cb169adb72db5820670a0cbdc0c59f93405506878899af168
94 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. ClamAV detection confirms this file is malicious, specifically identifying it as a phishing trojan. The primary attack pattern involves directing users to a collection of disposable domains, likely to host phishing pages or further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 4

  • 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
  • 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://tvsatkrosno.pl/userfiles/file/lupebalesulizamaruzokoxog.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3a261a14---tatamujapupoliruzara.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/82742129633.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/tojifotoxafunirevobo.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/fenitatuvaxakizerizula.pdfIn PDF document text
    • https://fong-cai.com/upload/files/47468019706.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/10167088525.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/10892092543.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/10354479282.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/55643565581.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613112742a4e8---90421801824.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/fokubikinegapipadidol.pdfIn PDF document text
    • http://adveotec.com/img/file/zexasasixavilijasetujir.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/tatidam.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/sodobivarefutunedok.pdfIn PDF document text
    • http://safarang.com/basefile/files/99143417980.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/47755728198.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/motukofomulukazosutuzoxup.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/25325054196.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/vuvixigam.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/wukuwukofusenaj.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/sokemimamowox.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/34753979429.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/49883350817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gun+war+apk+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 19136 bytes
SHA-256: 0a150aec3e9b273df26d90a5571c750275596c31f6427193ff00e0f2609ccbb8

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