Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d5008121c377ef…

MALICIOUS

PDF

72.3 KB Created: 2021-03-09 18:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6faf7e8c7fc34160f4094b796ed8ee3d SHA-1: 13451af7db0aac18615247b94b22282c41cd291b SHA-256: 26d5008121c377efb44c3f22b82bf0e8266042cb3c482ab823988b33aa7ac1fa
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-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.
  • 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://kuzutuzo.ru/strik?utm_term=math+workbook+7th+grade+answers PDF link annotation
    • https://cdn.sqhk.co/ninulekuto/qhcVFeA/crossroads_church_fitchburg_facebook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486199/normal_6007d0cd6502e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505839/normal_5fc907fc049e4.pdfIn PDF document text
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/4535135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_600a6b0a2c97b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_601b1dcfb1ac9.pdfIn PDF document text
    • http://tadurarawi.mypressonline.com/kedoxujav.pdfIn PDF document text
    • https://kefapadasogimok.weebly.com/uploads/1/3/4/6/134601884/xurezavalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_6031dbfc6bcf6.pdfIn PDF document text
    • https://kolabobinojojiv.weebly.com/uploads/1/3/4/8/134880551/4725246.pdfIn PDF document text
    • https://dexanobibe.weebly.com/uploads/1/3/5/2/135299911/6095397.pdfIn PDF document text
    • https://vetepoxep.weebly.com/uploads/1/3/5/3/135302771/loneteduwaxomalad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_600e6a5389baf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_601b05937b8b9.pdfIn PDF document text
    • https://cdn.sqhk.co/pupumukisev/z5Yijhh/fritz_kreisler_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488346/normal_5ffb88f19805c.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/repovefufevufosej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimimozoji.myartsonline.com/42866772249.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_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 5436 bytes
SHA-256: 2908bce1dbd497f5a1ba59de658ab69d83e8e9364a66e6e69790d588906695f3
font_01_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 11052 bytes
SHA-256: 99f0f5ab6004e1cabe3ea9310cc75ae0887edeb479dadf5208d89edc6a82a370

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