Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7d0315684a186d…

MALICIOUS

PDF

79.6 KB Created: 2021-04-07 23:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 99ef62ca184559a330e179553872ad54 SHA-1: 721d980088c2730c23105c27f57979fd7cf914ea SHA-256: 3a7d0315684a186dfc25d35440fd8e8870e2da08026ee09673ad0794a913232e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://soxebez.ru/strik?utm_term=solucionario+mecanica+vectorial+para+ingenieros+dinamica+9+edicion+espa%25C3%25B1ol+pdf PDF link annotation
    • https://cdn.sqhk.co/nadizolobe/fZidjgC/62152992818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471509/normal_604d35503da4b.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/hjeVihh/voice_changer_voice_editor_20_effect.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_600cfa3a187d7.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/blue_iris_software_alternative.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/JIjiih8/star_wars_live_wallpaper_windows_10.pdfIn PDF document text
    • http://resapus.scienceontheweb.net/polyembryony_in_mango.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/ib63bhe/a4_calendar_september_2020_printable.pdfIn PDF document text
    • http://pojibuvuj.mygamesonline.org/90476333199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_5fd6d0c9d9a1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_6046da511a288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5fe6b0bfbda6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_600e8e9fee18f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_603e7e67810fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_60544b5b33e98.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/69553921423.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449604/normal_5ff3752ccfa68.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/4a577bc9-31cf-4483-9f4c-31997c752533/36236655708.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/26130148362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ffabdd-c8fc-48b5-8bda-d9f6dbd7463a/14383239869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff86400e-4a76-45b7-8703-a8b90ae7ea2b/dizevokunebexaxixizeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8c806f-0488-4f42-a4d3-954a2cdace30/who_makes_ariens_mowers.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/18908385276.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_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 6004 bytes
SHA-256: 14fb3c665194293a40a7831d9d2219fa15a48a1a10821c997464df52d8576cb1
font_01_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 12024 bytes
SHA-256: cd6e8a5ece7787dbb19ba131b9bd105f2918078e51c42961c31f974614f03dff

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