Malicious PDF — malware analysis report

Static analysis result for SHA-256 b516fe9e4e5aa74c…

MALICIOUS

PDF

86.9 KB Created: 2020-12-31 16:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5947ad7014e61bae4e77a0f6f6b66ca5 SHA-1: ee5f82662330c6e6b8e0ab2d7cb5f498bf18508c SHA-256: b516fe9e4e5aa74c896b07b524aa539cd485b7be4c5c5154b432391847c9c88f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, with at least one identified as a known malicious redirector. The heuristic firings indicate the document is designed to link to external resources, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=daniel+x+alien+hunter+pdf In PDF document text
    • https://cdn.sqhk.co/koxixoneto/hgM1zpv/bluestacks_download_among_us.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367271/normal_5fcf743aa5ff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5f91ecd979192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402940/normal_5fdd0e65b78c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fc6cee13b4ee.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/8967537.pdfIn PDF document text
    • https://mewetoliwuluveb.weebly.com/uploads/1/3/4/7/134767879/32fc8276910874.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/e3Qgchy/92746605997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_5f90e0528ee96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479451/normal_5fcab25b22f68.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/0c602767-8d63-4658-a6d6-1b7e037b08a2/stickman_figure_penalty_chamber_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/890aa3ac-a25b-45b5-ab10-695bbc952596/kobakilu.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_off00011687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11687 5020 bytes
SHA-256: a04f32ec30c12f866b011fb041b82b25ff51cfa91c785da43497f093ff688944
font_01_sfnt_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 11744 bytes
SHA-256: 3c65ea471e97eacfb53bdf477cf716e2259dc43dc44dad8de0ef80e766d60e26

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