Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d75d35b7fac1f3…

MALICIOUS

PDF

69.3 KB Created: 2020-12-29 13:34:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: def94493c3bb80a2a96014759793f34f SHA-1: 7ff183a0a128057ac4db534204484f9f2dafd5ce SHA-256: 72d75d35b7fac1f30687716b7c5d0b5f5f48d735b5e3c8a31f34ad0d226786b1
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URL points to a suspicious domain, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cctraff.ru/strik?utm_term=frogger+exercise+machine In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f8cc4b19f392.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382629/normal_5fca6e42246b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393791/normal_5fb37fece0c23.pdfIn PDF document text
    • https://lotogifivetizub.weebly.com/uploads/1/3/4/3/134309957/161889287e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5fc0d771a3dac.pdfIn PDF document text
    • https://gugabezari.weebly.com/uploads/1/3/4/5/134577353/5745668.pdfIn PDF document text
    • https://togutugu.weebly.com/uploads/1/3/4/6/134617883/3465916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_5f9828b85776c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408881/normal_5f9ff93f59821.pdfIn PDF document text
    • https://pibazafefudo.weebly.com/uploads/1/3/0/7/130776509/01f879146efa22a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD198 5204 bytes
SHA-256: 4c3605b1be423bd1ae065dac6ab80dab48b1ad3e259d86b74b02af6727c28f38
font_01_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 11108 bytes
SHA-256: 9049531d03f56c0d00461da9308a18aad3102040a0e89bdfb743312870b0e498