Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ac8f8015e69e03…

MALICIOUS

PDF

74.4 KB Created: 2021-01-04 23:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bbdd49521325af1bebb5352fb0c33d94 SHA-1: e3a489ecebe21f77417e97fce50f7f8d2874e992 SHA-256: 04ac8f8015e69e031255876160dce87e4b490fece3ad3e557de83aed0e03c305
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links suggests an attempt to direct users to potentially harmful sites, possibly for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/123?utm_term=wedding+dress+with+cape+attached In PDF document text
    • https://roloruvibufezer.weebly.com/uploads/1/3/1/4/131410818/e3aff24dfca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450350/normal_5fd0ba426e4ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5fe9ca7c3f9f9.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/jcXdhgC/3490875019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f91892dd0f1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403415/normal_5fd8b4512252d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390681/normal_5fb9eb7aa9f26.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/hgIgpia/xevufased.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/d479610a-ba1d-4a85-9067-b1fe65c5be01/carmageddon_2011_dc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12f7dae-d1e4-4118-ad9a-0f9ec58e1241/computer_system_architecture_by_morris_mano_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8eaa88-516f-4704-8e99-037bec9d876c/fundamentals_of_piano_theory_level_1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 5408 bytes
SHA-256: 4a25c5ae9c8d875afb64c7512b9bf4183c0841e63d40aecdc412c9a839eace0a
font_01_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 10508 bytes
SHA-256: fe9ed27a003c043fc48e0d13ab25b2ba869ede89b695f13d5954759d7aca39e4

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