Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc126256d3f92d0…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 15:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac7b46a97c60460938e2b70fb9fe1696 SHA-1: 072d024da3301f9b319283e3c7deadab3f4bfba5 SHA-256: 0cc126256d3f92d0d9ecf2aa308b91b98e4980e4bd0e32443e85ffedaecdd158
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to a compromised site or download a secondary payload. The presence of embedded JavaScript (T1059.007) further supports its role as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://kocarbonag.com/luutru/files/loliwujixakapijumulo.pdf In PDF document text
    • https://value.ae/userfiles/file/dirawolinerix.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/musikekerode.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/84338949307.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_143826.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pukor.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/beturilowexuminife.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/kijefi.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/lowujapikidefoxezogesafiv.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/51832448201.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/gulosulapepepuzozu.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/neviputoz.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/71264163424.pdfIn PDF document text
    • http://sial.pl/galeria/file/parilolilujise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=advanced+organic+chemistry+by+arun+bahl+and+bs+bahl+pdf+free+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_off0000be9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9F 11556 bytes
SHA-256: 0c7d58b6a1e391441cac3c8679c9c955bf0587f5ebdb4964ee7614a12e24edef
font_01_sfnt_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 17548 bytes
SHA-256: 82547c27ca49442a56b801d21021116ca1621ad1519709f20a6c2e0cfea6f919
font_02_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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