Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c990c4383cb7278…

MALICIOUS

PDF

70.6 KB Created: 2021-01-11 12:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94b4e0fb7f968251766ec8a4f91788b1 SHA-1: e97f824f0ddfced270fea90069fabdec87c6bcd9 SHA-256: 8c990c4383cb727896ed5078879e3567527a74d1c0fe089a8825b937ed8d2819
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the presence of an external URI suggests the document's purpose is to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/aws?utm_term=osteoporosis+weight+bearing+exercises+pdf
    • https://site-1173855.mozfiles.com/files/1173855/68863797998.pdf
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5fd80e13d3d5f.pdf
    • https://cdn-cms.f-static.net/uploads/4382412/normal_5f9e7f0b4d38e.pdf
    • https://site-1174658.mozfiles.com/files/1174658/dojige.pdf
    • https://site-1178980.mozfiles.com/files/1178980/bagger_dave_s_nutrition_information.pdf
    • https://cdn-cms.f-static.net/uploads/4414488/normal_5fd92dc35fb48.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mokuwanibof/seal_point_cats_for_sale.pdf
    • https://s3.amazonaws.com/wolina/menu_costing_sheet.pdf
    • https://s3.amazonaws.com/vixuwogetiv/defatogaf.pdf
    • https://s3.amazonaws.com/vigevot/balloon_air_vector.pdf
    • https://s3.amazonaws.com/jenisozazewubo/uniform_crime_report_history.pdf
    • https://s3.amazonaws.com/kalanejaxutilif/7810628141.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d830.bin
95db8ac9007240f2560afa3422bff19e8d359ef30aec7ecca0fba54a7c82d843		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 5712 bytes
font_01_sfnt_off0000ebaa.bin
aa7d564e9e97afa1793f878beed8f205dc162855cba9cf3c7e43d7327916fdb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 10020 bytes

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