Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af373a58472cb6d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 08:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 953b9e478dc8ae97d7a5757e0131b06f SHA-1: e177d40d0068118c9628c7374e5af2acc03cf74b SHA-256: 3af373a58472cb6d71f47817f7a6a2cc76de78b3015f0a5003e305e868e3ad8a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The embedded JavaScript is indicative of T1059.007, and the overall structure suggests an attempt to lure users via a deceptive document, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://shop-exclusive.cz/userfiles/file/20397458764.pdf In PDF document text
    • http://studioingegneramato.com/userfiles/files/pelafamamakizetexatizifet.pdfIn PDF document text
    • http://thegioioto.store/upload/files/minajonomuluv.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/javagusexat.pdfIn PDF document text
    • https://hgb.se/filer/file/jemoraruwepexedomufuparaw.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/66128004415.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/15848503782.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/tegid.pdfIn PDF document text
    • http://asja.ua/userfiles/file/movoxunaretimoxitowasikiw.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/tipuwevarusisuwadazibanu.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/96798238634.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/50677523993.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/71811773774.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/1169683092.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/85827667456.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/48588872476.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358a1996620---11579865269.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/35372971646.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/6388386646.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/binuloralefi.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210914_012506.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/74497993083.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/bowavodovoratil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=edge+of+tomorrow+streaming+free+vfPDF 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_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 19448 bytes
SHA-256: c76b31cc44ae48600aab6c9aef8d66d7d6a8e4dfc8108129cb62c3ac3aab5c4e
font_02_sfnt_off00012495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12495 10784 bytes
SHA-256: 5cfb32d8c08f2f27b4a819ada74a3cea7466de0b95ed50b09c9241d0c6d823c5