Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb39b6319e3a7826…

MALICIOUS

PDF

83.9 KB Created: 2020-11-13 01:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3d18cf5055e8fc5f1c281c55185ea020 SHA-1: b77717c78488f069937a2dbe38bc0148e1233b10 SHA-256: bb39b6319e3a7826fa88a0f0bbafb7d67f3f79992460d69f5d310f58ef737461
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The primary link directs users to a URL containing search terms, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/123?utm_term=death+cab+for+cutie+plans+songs In PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/72334e.pdfIn PDF document text
    • https://pewaruraxifazof.weebly.com/uploads/1/3/4/3/134340131/2710055.pdfIn PDF document text
    • https://kevugekakizuxo.weebly.com/uploads/1/3/4/4/134481001/9217850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f87197057692.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/kukukosavebid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5f9132fe58556.pdfIn PDF document text
    • https://wotafoxig.weebly.com/uploads/1/3/4/3/134306194/8226588.pdfIn PDF document text
    • https://lesavudipuvu.weebly.com/uploads/1/3/4/3/134338744/kuvup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_5fad795725893.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/9ab65b04f6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_5f8ee43992e4e.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/aaf53d98-886c-46f8-920d-bad76b422284/pedutexitejewobupanem.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_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 5416 bytes
SHA-256: a959207e18b26569fcfe3ec00d35651c397a3a9de597814de9e4ac1439e6149f
font_01_sfnt_off00011e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E87 10520 bytes
SHA-256: db64c8537334981e7cc0179517d12272d08eb7d73886b3fee746c298befea4fe

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