Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66acc66dd315ec3…

MALICIOUS

PDF

113.8 KB Created: 2020-12-30 03:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1efeecb45b1ae2c0694b4ec8583e6a0e SHA-1: e5e7cb59a86eb6863fe82ba411fe709696db07a1 SHA-256: e66acc66dd315ec3a8accec8e850d8cec268747ad8b23b6293b31a7ebd85e2ee
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirectors, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the link farm structure strongly suggest an attempt to redirect users to malicious sites.

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
  • 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.
  • 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.
  • 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/strik?utm_term=journey+to+the+moon+and+back+movie In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403820/normal_5fe0e127a1934.pdfIn PDF document text
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/sakusufimofarutox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5f89d5cfc9ce6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458840/normal_5fccb5803c901.pdfIn PDF document text
    • https://cdn.sqhk.co/xogedusov/bhdEhe0/download_fleet_combat_2_mod.pdfIn PDF document text
    • https://gofobodobade.weebly.com/uploads/1/3/4/4/134444694/bujunaludu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410448/normal_5f9cfd47193a4.pdfIn PDF document text
    • https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/72655ba.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/kejegusi-kojurutita-gepaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5f939284ec525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_5faae702aa5ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369651/normal_5fe214b271868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484380/normal_5fb827bc62f26.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/cdfec31ccd6474.pdfIn PDF document text
    • https://munivimisidifi.weebly.com/uploads/1/3/4/7/134772296/8732740.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

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_off00017d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D32 5324 bytes
SHA-256: 89963466c4a0f8e1e144cee21c4ed976ea3aba6ba5afa4294d74ee19c65db557
font_01_sfnt_off00018f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F2B 13536 bytes
SHA-256: 2326e530456e4bce130e7b2471b1aba2e3515659cdf87897a6a628204e066a8a

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