Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47c1c8ceb90a7df…

MALICIOUS

PDF

73.4 KB Created: 2020-12-26 06:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 50d8594832186256680bb42069e7260a SHA-1: 639f550450fc63df5c652228a788980b30e47217 SHA-256: d47c1c8ceb90a7df8b1b73736a1448da769a72270687dd839442eec5ae684b0a
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a crossword puzzle, likely intended to trick users into visiting malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ggtraff.ru/strik?utm_term=d+day+invasion+city+crossword In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f8fd7d12ac3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470223/normal_5fc7016c56e2e.pdfIn PDF document text
    • https://bizugejukuvav.weebly.com/uploads/1/3/4/3/134322279/594916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_5fbd7d90c9c43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498324/normal_5fc9a16bb0577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458824/normal_5fb9bae5df2d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_5fb02878580e7.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/e9736f62-bf81-460f-997f-3ed1e3aa5cd2/notopalupiduzevo.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/spanning_tree_protocol_commands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0f80fc-b65b-41b0-915d-c755b4a0a36f/garmin_etrex_vista_hcx_manuale_italiano.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_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 5156 bytes
SHA-256: 330df1193bfd8942acbf75fb41ac08e1e6a76d9b7bc8a8ac40459168c340cd61
font_01_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 10260 bytes
SHA-256: 1db002f322822147e7b3c2982e91e0209fbefa89d647b0bf38319f15e41b0bfb

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