Malicious PDF — malware analysis report

Static analysis result for SHA-256 25621a12ee34069a…

MALICIOUS

PDF

63.6 KB Created: 2020-11-24 09:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 20a9886ce0b1ca799111d733444f4c57 SHA-1: 91562cf309e3f5c91a40ee55d3a5e8702c663b18 SHA-256: 25621a12ee34069a0a0d772cc4be068a11942e5584fe2632e18ba6594b8e4171
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=frigidaire+air+conditioner+5000+btu+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4452381/normal_5faee74168a11.pdfIn PDF document text
    • https://jupisururixed.weebly.com/uploads/1/3/4/3/134339091/29a35d8.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/fe34ed819a.pdfIn PDF document text
    • https://xoretesani.weebly.com/uploads/1/3/4/3/134315313/rijusa_lodefuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f98a79a71ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5f98323550bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f8da46a9f1a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_5fbb6b74a5f1a.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/rebomedug/90161800391.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/nice_guidelines_for_anticoagulation_in_atrial_fibrillation.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/47700544395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca7e9be-956b-460d-836f-350ebedf0464/willam_belli_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/18878391136.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_off0000bbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB1 5444 bytes
SHA-256: 71ffccdc0a3a95720e948b1224292bc1aa128d2082e21f8f29ecfb80de42896b
font_01_sfnt_off0000ce22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE22 10424 bytes
SHA-256: 1e7367abf31396b4c6ef95ffe0c5734b61c46a78243b995fd43df21977f6fe58

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