Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b95e66dce40289f…

MALICIOUS

PDF

72.2 KB Created: 2021-06-06 01:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4a622bbbc892cb1fa5377c123491a442 SHA-1: 214b295c02e37ad3eb4a7a38e1817dcc30fb64bd SHA-256: 3b95e66dce40289f091af1e5c59701ce48b0e10b59c5b39919f4a961b2a37474
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or redirection attack.

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://laborke.ru/pbw?utm_term=los+12+pasos+de+alcoh%25C3%25B3licos+an%25C3%25B3nimos+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379054/normal_60206624d303b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418365/normal_5fc73d4c13004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_60570bdbde25a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5fdbc8e9da3d5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412154/normal_60b461c9929c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_60205baac639c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5fff839477580.pdfIn PDF document text
    • https://kimewazokedusa.weebly.com/uploads/1/3/1/4/131454536/gokifedasuxojurore.pdfIn PDF document text
    • https://tidijutaxidekoz.weebly.com/uploads/1/3/4/5/134589823/9361723.pdfIn PDF document text
    • https://zufuvedowenekoz.weebly.com/uploads/1/3/4/8/134861022/gulamu_xunumisuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_60108c93488f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikasamu.pbworks.com/w/file/fetch/144466590/climate_graph_worksheet_year_7.pdfIn PDF document text
    • http://goferupemo.pbworks.com/w/file/fetch/144680193/nasixabegomudezapofiwe.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/dead_cells_100_save_file_1.7.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144417609/vuxetisuvivimasoxepe.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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 5560 bytes
SHA-256: 1d97edceb4a81dfa80b65007d1d930d01362b532d6054ffc4693b03a28b2e4a7
font_01_sfnt_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 11052 bytes
SHA-256: 0d7223c912ddf50019af5cc16542d4d49ab18f6208a12caacee2cd41452cf311

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