Malicious PDF — malware analysis report

Static analysis result for SHA-256 6346132917a57e5b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 09:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37c129bda2df122e1953827d6f1a90cf SHA-1: c88f871f80831fc6f39ddc4450ba2c404b1e51ed SHA-256: 6346132917a57e5b9258cf3007e9220c4790c522fabf365cee9dbd49cd2cdea8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with a high-confidence ML score. The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm or phishing attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically calls out this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ubest.ru/images/file/70911173655.pdf In PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84339369043.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dfshh31uc826ql3qe3clg3vcle/44350843569.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/24231882442.pdfIn PDF document text
    • https://krossi.ru/images/content/files/tunone.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/takevutiraxop.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/vizowizitogorigu.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/repur.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/zidevu.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/ponuxulawobumepusiwa.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/wunobag.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/62472292664.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/5878990940.pdfIn PDF document text
    • http://greenld.com/userfiles/votazivepofejinu.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/sotekagagifevosolutudoj.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613271f392eb3---10927196696.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/55915961326.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631145201.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/mejafekaki.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/68759861270.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/70550792119.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109020959292553.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/seguf.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/guvibulufawofufoja.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/30349796514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bf+comedy+shayariPDF 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_off0000c2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BD 10660 bytes
SHA-256: 904d1ccd3c72740a9962fe3b00c9fe741d33184a23641ab80de9e04296fe143d
font_01_sfnt_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 20576 bytes
SHA-256: e7408c16d7e7787fe5879cec71bf227f696844de89fba99c55ba5b0f09606d63
font_02_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1