Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aff59c9d76533a5…

MALICIOUS

PDF

63.8 KB Created: 2020-11-19 22:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7428b609d45b449185c79f4391be3607 SHA-1: 1bfd1e0322ec591581e49df7c6afa934e4f4bf79 SHA-256: 7aff59c9d76533a5a01e8611e51d168577fe7fa01fa1a154959943a5da3de957
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://traffine.ru/strik?utm_term=slither+io+private+server PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465556/normal_5faa2f410a0c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f962db1cbf63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f8aa0442e438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5f91daff44fff.pdfIn PDF document text
    • https://pafuzoxim.weebly.com/uploads/1/3/4/5/134585506/pikegubupekesi_jarezog_jegoluzow_deruvubejupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_5f8e1153bd59c.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/6db6410f-0a40-49da-a03d-89bf596e67a3/4582443938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9feb43b8-d667-48b2-9f2c-d8a12ea5818b/libro_yoga_iyengar.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/como_superar_la_ansiedad_y_depresion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9eb051-33bf-4551-b9f7-5edc27335a15/duzexujozokisupasizawuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/hemp_tycoon_2_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d0dacc-d4ba-4e1e-8daa-9c792699ccbe/vinulop.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/sony_liv_apk_mod_by_binu.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_off0000b885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB885 5068 bytes
SHA-256: 19512462c00c81dd1f97ec5d95c399762f984ebcf93198d3c4ee3c146f12aa81
font_01_sfnt_off0000c9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BA 12916 bytes
SHA-256: feff596df14d41649e1d6d23b87d0f232865237bb3cd4f9a76dad01256de9fbe

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