Malicious PDF — malware analysis report

Static analysis result for SHA-256 c213f8bac9001bb0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 06:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fee220c4988633aaf50f7dec5e7fa4b9 SHA-1: a8cc92216fe855cf560f2bc4ae9bb73f3acb89e3 SHA-256: c213f8bac9001bb01b3fe975836072d1d90b7e3d2a4a5cbde2c9e016031e4dd5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The presence of numerous external URLs, many pointing to PDF files on disposable hosting, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://wastran.ru/uplcv?utm_term=urie+bronfenbrenner%27s+bioecological+theory PDF link annotation
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/bonanonogibis.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/42627769688.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/sufudewixulovagadoreket.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/xemugawenufataxodotarikol.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-3/20210903055555721963.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/jigok.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/25241502491.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/83891113364.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614a25a500abf---sulixizux.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/13172169131.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/gakadusetawaxav.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zobifivopigezewumigoputol.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/mewexelosevevoruwagaxije.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/28885797898.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/89983918279.pdfIn PDF document text
    • http://ippon.lv/uploads/File/91717662323.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/58739484529.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/radodo.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/dibotaw.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/87523589078.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/67882374726.pdfIn PDF document text
    • 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_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 10908 bytes
SHA-256: 3658f45dac82deacab6817e4b40e680d54e520917e1405753caceb29c4a7dbb1
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 18436 bytes
SHA-256: 642abdad69365ca39a6882d4495fe52d803cec67a51a30237259fa09f7fc47af
font_02_sfnt_off00011f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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