Malicious PDF — malware analysis report

Static analysis result for SHA-256 603f5788262dfdfc…

MALICIOUS

PDF

80.6 KB Created: 2020-12-16 16:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 677e6345a28bea5815fa5d15a3e0ec48 SHA-1: cf243413ec4b9a11b14f9f6254e1043db09f495c SHA-256: 603f5788262dfdfc47238ff906ac3cb41fe395eafc6547077d1e20cc5ac7ebbb
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The primary IOC is the malicious URL embedded within the document, which is likely used to lead the user to a phishing site or a malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=single+cycle+vs+multi+cycle+kinetics In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5fd89db1dd78d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5fac068d405fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f89c2de0dd9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409420/normal_5fbbeb9587be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_5fa2707a1d303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fd68a5cf04e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469119/normal_5fcc9d0a63c78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad763277-3696-430e-a7fa-24bb2bf93d9e/65741150793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df86906-94be-47a9-9c43-4463f820e5b9/67186740803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e8b285b-4dc3-4069-af3f-6aa0178637d6/super_juice_me_28_day_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1fa568f-a742-4d9a-88a1-a7a94e1c1f15/12346586983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500545ad-6092-44c3-8980-108f5d1416bf/livro_da_bruxa_evora.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://scripts.sil.org/OFLIn 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_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 5144 bytes
SHA-256: 87c3facbc4d2fc907442e2a6dd6eacc854bc206844eae2c14c5cc72ff0f6aa52
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 11092 bytes
SHA-256: 659f46c6d3a78f766a46bad3544d912b8b32bd1fd4ab41b288624220fed81c04
font_02_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 16148 bytes
SHA-256: aabbb95e4258a1bccfe6759090a0a8b97a33e8154131110566ffb2eaa8fdb080

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