Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbcf45dca91ee8b…

MALICIOUS

PDF

67.9 KB Created: 2021-02-27 10:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 00c4190d916ee22dc08d1b219b75f411 SHA-1: 177d414be9f0ea62e32f2a835fdb229eaa48dc11 SHA-256: fdbcf45dca91ee8b01194f8460c62a8f597e4d5d75f07f93875f8b3848b81493
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/strik?utm_term=all+souls+church+englewood+colorado PDF link annotation
    • http://kujunat.medianewsonline.com/munisabezon.pdfIn PDF document text
    • https://cdn.sqhk.co/bozogekeji/Uhghjic/35480739302.pdfIn PDF document text
    • https://tewavifoma.weebly.com/uploads/1/3/4/4/134482239/258950.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/igWNKhd/pixel_worlds_admin_tools_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367643/normal_5fe550f872beb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405638/normal_602bf66446a07.pdfIn PDF document text
    • http://form-copyrightservices.com/affirmed_meaning_synonymnbwxb.pdfIn PDF document text
    • https://galewijukinez.weebly.com/uploads/1/3/2/6/132695540/devufodanemoge_lupuneb_barijamixik_fikadoxivi.pdfIn PDF document text
    • https://cdn.sqhk.co/mivufarowiwi/oTshiB8/45721650651.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/ghcggii/91496379261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_600a8800719ad.pdfIn PDF document text
    • https://wanibezitajijo.weebly.com/uploads/1/3/6/0/136000154/cf9e2615f82c7c1.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/HojiFjc/36603500857.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471235/normal_5fc79b622d704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489722/normal_5ff2ae79339bd.pdfIn PDF document text
    • https://sigibemora.weebly.com/uploads/1/3/3/9/133986782/1525760.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_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 5280 bytes
SHA-256: cb32392ea46ee3e39761820d6adf83b08846de906663ce354c3a951d863ae0db
font_01_sfnt_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 10500 bytes
SHA-256: dbfceaf49b8cbffc2988e0470f2ef563655c93aa91fb4ef702c524f5a0391b02

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