Malicious PDF — malware analysis report

Static analysis result for SHA-256 c421fb8512d95a7c…

MALICIOUS

PDF

68.3 KB Created: 2020-11-30 05:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cecc894cc7a63b0dc8053e2db1fc391c SHA-1: 91317196cb579f8069157856ec1b1f2cfe5c4b80 SHA-256: c421fb8512d95a7cbf3c2b2b3f4cde2e9a249fa5cf54873e9be710f94fa1bf36
156 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. 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
  • 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://trafffe.ru/strik?utm_term=seymour+funeral+home+investigation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491450/normal_5fc4625d8ef7a.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/fizobajezefazes.pdfIn PDF document text
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/wafaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_5fa0a3854488a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_5fa8bcf16fb6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_5fc2a23213575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_5fa8547c3179a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f89600da1642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476122/normal_5fafd2c10b4d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493266/normal_5faf7e1c207bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_5fabcf717df30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5f8f581da3991.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/varoximu/93408738969.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/website_to_unlock_chegg_answers_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/74876455132.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/vlookup_dan_hlookup.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/88665248558.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_off0000d009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD009 5448 bytes
SHA-256: 0e0ea35b9944c247e102864653e3a365b47cfa1e43311f9d8d0ec1f177e5d98e
font_01_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 9896 bytes
SHA-256: 43d6b1756d50c5538b856ad729ecadd286cf17d3ca66c68e192dfabf5db50745

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