Malicious PDF — malware analysis report

Static analysis result for SHA-256 966bdf5f1a756e43…

MALICIOUS

PDF

72.1 KB Created: 2020-12-28 20:00:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4b6d405c4209f43c9219b5b2ba5c344a SHA-1: b2bdd8577e42db0457e0adeabb938bc94ee41e8e SHA-256: 966bdf5f1a756e43824de8c39372b8ecd6ecff957c976d0a6021a41e13dc4a1c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, appears to be a lure related to 'balancing equations'. No scripts were extracted, but the presence of malicious links is sufficient evidence of a harmful attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/123?utm_term=balancing+equations+with+polyatomic+ions+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_5fc294a4da673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5fe813ce0b1b7.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/kidekiga_kenumesilesegom_xatuvarovu.pdfIn PDF document text
    • https://nidupivulef.weebly.com/uploads/1/3/4/0/134042353/7582754.pdfIn PDF document text
    • https://kosigejobawazi.weebly.com/uploads/1/3/4/3/134315380/savixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475737/normal_5fb5f89c12a34.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/3ad2990e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_5fd5fe9602d22.pdfIn PDF document text
    • https://varemajog.weebly.com/uploads/1/3/4/5/134585454/4820573.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c6220cd-1101-4922-8fa1-e7bc9005fc0f/dancing_with_your_ghost_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38af5da8-1e51-4707-a10c-bb9ccffbbbca/botadaxuvaxut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb4bf71-ee31-4f8b-8440-00ac17581d04/bailando_spanish_mp3_download_pagalworld.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 5780 bytes
SHA-256: 51d584e0b1429575fedfe5eebfe6f7aa40e2cd02a5c0d7d83baeeb82177b1458
font_01_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 10644 bytes
SHA-256: 380e3b95a888b13ca77e894100acf06c3b6610217727b800a73b09627b9d6f88

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