Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43c3db62d830e00…

MALICIOUS

PDF

74.8 KB Created: 2021-03-30 07:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1ec8249cd69ca2aac5541732cf2e49bf SHA-1: d08d84a84629163b77db445cfb670c18c04ec43e SHA-256: b43c3db62d830e0063de3e15511663319e6ecf5350ee120b4a8311f14b738a69
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to a wide array of external URLs, potentially for phishing or malware distribution.

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://jumiwimov.ru/award?keyword=complete+bodyweight+workout+program+pdf PDF link annotation
    • https://jesokawafaz.weebly.com/uploads/1/3/4/6/134626724/6269457.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/system_analysis_and_design_project_proposal_example.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/jhjgPIX/africa_toto_bass_tab.pdfIn PDF document text
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/4093976.pdfIn PDF document text
    • https://cdn.sqhk.co/badilapo/jeih6jh/eau_guidelines_haematuria.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/ha0bKjd/vobezugabewazovako.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/11143076597.pdfIn PDF document text
    • https://mavevataxivira.weebly.com/uploads/1/3/4/6/134600118/b5550fb77a.pdfIn PDF document text
    • http://bulubuzigajuzar.getenjoyment.net/encyclopedia_of_mathematics_james_tanton.pdfIn PDF document text
    • http://depusapo.mypressonline.com/lirokuwugolonu.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/c36b0e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408711/normal_6046c8f9db535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_60446ede2da94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lapetagalelan.myartsonline.com/47201632372.pdfIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_85e2f963f0834f90bfd9bd6588d9443e.pdf?index=trueIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_066c9d5fe68346a4aeade9000566662e.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_eb599d452606462098e8c1571c7e1f87.pdf?index=trueIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_dc06f4c77b1e4722885e8d3ae9106fa7.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_8bdf385dda724893bb2bddde9012a411.pdf?index=trueIn 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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 5580 bytes
SHA-256: 7b95c509646f2d253b639e7ce28a856ec332dab30a0e52703b0d848a9608dcaf
font_01_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 10740 bytes
SHA-256: 96efe0dfffd56f167f1e006119c6bdb45ec3a336f0cdca4e3a5ef5d9a4402c4b