Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b58f376d59d098a…

MALICIOUS

PDF

68.2 KB Created: 2021-09-18 22:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95abb059b16f02fdd4be30551b6174a6 SHA-1: a2e33338fb1d3593c9c8c235c1491a84a0c3fb52 SHA-256: 7b58f376d59d098af4d615a64ad7e41869ab47025c0e137985bc89f71d1e58cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on potentially compromised or disposable hosting to obscure the true malicious destination. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crysiq.ru/uplcv?utm_term=little+women+pdf PDF link annotation
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/03ed098d2e3187a87824dea99a7a5fbd/mimivikuroradatedos.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/xajatiputivimiw.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/92065746788.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/60693866768.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134926ae72fc---fusaze.pdfIn PDF document text
    • http://riviera.az/userfiles/file/1281789669.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/jepijageranuxude.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/jomenige.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/47676745626.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/ramodoretagoxaladetem.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/62041705857.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/18137409094.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/vijubofaz.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/xamadudami.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_off0000a949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA949 10272 bytes
SHA-256: 844f2003852874d8a092bf284a2171369a4009404f85aea3d8321a6ad2363f0f
font_01_sfnt_off0000c054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC054 17064 bytes
SHA-256: 9363c01c8a25dae3b4c0011a826c5902ee0ec8b5add7011b6d345a842672b645
font_02_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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