Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3f89135f73ab0e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 09:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a606c3ef6f2d0ce42f237723255655c SHA-1: 22bc3a32532c050bf2aa9241d185696112db56f0 SHA-256: cf3f89135f73ab0e735cdb6cf4f77724ced17d8ebd9f671f88cf35fff75970a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on potentially disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the ML classifier strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://peoplefineart.com/assets/202109/files/20210903060833138478.pdf In PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/76608261491.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/luzedojivi.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/7810285926.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/mejita.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/19054895375.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/nawikudimebipu.pdfIn PDF document text
    • http://www.bash.cl/media/file/78637666250.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/75635385830.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210903215130.pdfIn PDF document text
    • https://terracell.info/images/file/vejexarokujejaba.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/vowuzetiwiveporimexalugog.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/wawojoji.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/65970614169.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/pokijozaxomuxevasej.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146189c670a0---lenerarekijusepubate.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/sikukefulusevodaduwazasu.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/wigidugorixikozumasaf.pdfIn PDF document text
    • https://stormester.no/files/file/37808003769.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/vivetifonapekujunasak.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/93092593402.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/jutideboto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=final+fantasy+8+android+apkPDF 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_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 10748 bytes
SHA-256: a2ce68bd699a99163949839ec17670cd2facd9da75b1e65d787839bf7addeea2
font_02_sfnt_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 19476 bytes
SHA-256: 64a5c4723c455b2f36a743debcea24655e91bdbf372ad4b59c94af37ce3d1846

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