Malicious PDF — malware analysis report

Static analysis result for SHA-256 5741c72a9f362bdf…

MALICIOUS

PDF

78.6 KB Created: 2020-12-26 11:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 31cc78b0babbbf8d06a9e206b978aae8 SHA-1: 2b98994a2b214969b4bea97feeb6a32ea76205d8 SHA-256: 5741c72a9f362bdf3dd6fe8c52965ffd91aaf0cb0cb1df82a132ad6229b9a43c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous external links, with one prominent URL being traffset.ru, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains metadata related to 'Server stats discord bot github' and the wkhtmltopdf tool, indicating it might be a lure for technical information or a compromised resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/strik?utm_term=server+stats+discord+bot+github PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459787/normal_5fddfe9e68982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f88cce4d7eed.pdfIn PDF document text
    • https://rajitogo.weebly.com/uploads/1/3/4/3/134377965/9750863.pdfIn PDF document text
    • https://tidixusega.weebly.com/uploads/1/3/1/3/131380021/8523636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414336/normal_5fb7dd0c89c1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486359/normal_5fdf9ed1a7755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446638/normal_5fda801a29d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_5f9d72028e5ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_5f9500141cdaa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/20548515473.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/55690362322.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/tiny_asian_teen.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/crack_software_sites_list.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 5472 bytes
SHA-256: b176d780086399a735eb4a7e114cc0328dd5122b650ff27b13678bcfdcb82465
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 15128 bytes
SHA-256: 38bb403b87d66979c1e4b8f7e0c4ed6174ccd344f5db1596c9f0af958d71cfa7

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