Malicious PDF — malware analysis report

Static analysis result for SHA-256 142417df0fcba793…

MALICIOUS

PDF

83.6 KB Created: 2021-01-13 20:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 579424fdf2918adcff642cd29963b341 SHA-1: ebd6d89caa053c1d4000ad402ece0858cbf98fc9 SHA-256: 142417df0fcba793cfaa3bcf6f80acc0714994f5d5b8123fa5c8fb115d77e149
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/123?utm_term=nbme+ob+gyn+form+4+answers'. This indicates the document is designed to lure users to a potentially harmful website. While no scripts were explicitly extracted, the PDF structure and the malicious URL strongly suggest a phishing or malware distribution attempt, aligning with the Spearphishing Attachment technique.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffmen.ru/123?utm_term=nbme+ob+gyn+form+4+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fa6ea78bf271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5fab26f0badb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5fd33953652f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445558/normal_5fad4aab149ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_5fa8d68cbe5a4.pdfIn PDF document text
    • https://site-1178275.mozfiles.com/files/1178275/best_shooting_battle_royale_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428061/normal_5fa251e2a812e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423429/normal_5ff2864b2e2b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408588/normal_5ffb1a939bcbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_5fac3f9451f30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418185/normal_5fe8654887900.pdfIn PDF document text
    • https://site-1204510.mozfiles.com/files/1204510/23138389057.pdfIn PDF document text
    • https://site-1177347.mozfiles.com/files/1177347/vugelagiluvuxiselul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 5108 bytes
SHA-256: 5bf58fc4fba1050c8f4ad469e804bc0e8a86e7963d3d3ffb14938b31f0d2a972
font_01_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 11308 bytes
SHA-256: beff5e559c42ab729749d96e0834ef69bf8d4654149f1f4aa634e023c0b6a7fe
font_02_sfnt_off00013369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13369 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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