Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b771b86ac0c1bc…

MALICIOUS

PDF

69.8 KB Created: 2021-03-15 20:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9414051f5e06f24acbdef3ada895bdfa SHA-1: d55516656472d3a34f4f168dca0dfc337451e747 SHA-256: f6b771b86ac0c1bc6944fd1ad36d41b89120099dafb56465cfb1c2e3a4d89d4b
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing campaign aiming to deliver a second-stage payload.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/wix?keyword=space+derby+kit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495254/normal_5ff14b801ec3f.pdfIn PDF document text
    • https://cdn.sqhk.co/piravasufinu/hjjihgd/color_splash_effects.pdfIn PDF document text
    • http://instacopyrightcenter.com/mind_games_to_play_with_your_familyisygk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_600d0f7a27ae8.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/gdjccR2/loopback_audio_for_windows.pdfIn PDF document text
    • http://fbcopyright-center.com/56222162628oq6oh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_5fe7c34812d7d.pdfIn PDF document text
    • http://justiciaforjustice.com/14482397918ert2z.pdfIn PDF document text
    • https://cdn.sqhk.co/pesunexaxak/hd3hg5K/kijuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456391/normal_600b1f8415a7d.pdfIn PDF document text
    • http://canlisohbetim.net/mipiteia4qh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455399/normal_5fc9a6c597ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_603de2a8da673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5fed80d383c35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418590/normal_602a414144a29.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/jjjejeP/fpv_freerider_pc_free_download.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/tqm_gestion_de_calidad_total.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/Z5zhghO/38223418690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501775/normal_5fdf0e6cf26cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378857/normal_603d0f646a67f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitawidavez.atwebpages.com/30546248138.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_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 5268 bytes
SHA-256: 1895dc9d764fef82e54b6c250cafe0be6232078f037e72d543231d4db654ef33
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 11444 bytes
SHA-256: 79ea5523aaddec96a1ed869dbc8b6f174a9b88b51cda93f6aabf942d29bfd995

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