Malicious PDF — malware analysis report

Static analysis result for SHA-256 70eaeb67630441e0…

MALICIOUS

PDF

74.6 KB Created: 2020-11-23 15:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 36bc40454678f1b5257c0a6962895267 SHA-1: d93bf7d00f88608e3da3559b49b0e844e7d71e69 SHA-256: 70eaeb67630441e085d77e1eef2cd09d8c5de39cca688713b5088bf16a97bf81
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?utm_term=writing+structure+5th+grade In PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/61eada71f20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5fa09eb7cbc44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f9aac0303529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_5faee6fa195bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5f91d855c4957.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/9308642.pdfIn PDF document text
    • https://nolaguga.weebly.com/uploads/1/3/4/3/134307058/4340927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_5f87ecd7d5f47.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/f07ba3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5f99af7d78579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_5f8da5939315c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 5308 bytes
SHA-256: 06a5fa73e46005a00c27c9ffeb8d1d6c6a6742ad08f6f350d16f2f442853c28c
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 10588 bytes
SHA-256: 217ff56bb94189e01f12e559e32924f9e913bdb9400d653b3c89240826edde20

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