Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca3cceedd06c8ef…

MALICIOUS

PDF

85.7 KB Created: 2021-09-11 07:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73f42f6341b07351416a048a68cfa21c SHA-1: 95afbb5455105b184d4071a5f8f8177124dfbe0b SHA-256: 2ca3cceedd06c8efe68c9b3c2a55df375b977122b5230e3b7e2e44d506a08e0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting, suggests a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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.
  • 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://ka-base.no/images_students/files/64045294796.pdf In PDF document text
    • http://szentimresiklos.hu/upload/file/xosoputonemuzadivami.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/lofav.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/5184040322.pdfIn PDF document text
    • https://msiutilities.net/documents/nanodiwugetosag.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/domebines.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/70769210253.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/77848952214.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/kibekexezuwewunuleva.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/42925343644.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/ginetomam.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/zebebi.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/jidafifa.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109102018168820.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/zedufazejalisawanijatago.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/47698684916.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/85140702955.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/71132074943.pdfIn PDF document text
    • https://parkettworld.com/upload/files/33945485189.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4772e79a---19934377666.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/28495491489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sim+2+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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 9932 bytes
SHA-256: cef1988c60ca3ffc531c2b5dedc344f555c76e134c322b87b23793ead1468180
font_01_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 18836 bytes
SHA-256: 5600595f4fbbc6ab497c52af84d2ab2176d913018f0023b1a10aba350107b6c9
font_02_sfnt_off0001318e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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