Malicious PDF — malware analysis report

Static analysis result for SHA-256 103e7cc94099fdc8…

MALICIOUS

PDF

82.1 KB Created: 2020-11-13 17:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b3809e0cff34be402b35603f9ad8ae1e SHA-1: 29b4b3d929cb1c6884a319e4e6322d808941c930 SHA-256: 103e7cc94099fdc8679ae164b4cb274af0133cab29c075bb9a7cda918e561cb7
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=descargar+peliculas+disney+latino+1+link PDF link annotation
    • https://sepijoverik.weebly.com/uploads/1/3/4/3/134317252/8133618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_5f983988b93eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_5fac04b1277f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f899469aadd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5fac22cbc62b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_5f9afd7ae03ea.pdfIn PDF document text
    • https://juzapojoxop.weebly.com/uploads/1/3/4/3/134370352/d85ee443fd02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_5fadfaf90bff2.pdfIn PDF document text
    • https://fokomowopijav.weebly.com/uploads/1/3/4/6/134643156/kajelixaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f9bb29f46b47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5f8d08b5f2c21.pdfIn PDF document text
    • https://fegilekupajot.weebly.com/uploads/1/3/4/4/134404616/1182331.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/3e1158b3-f5ff-4c7c-b19c-8ca38f078f0b/99117687018.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/61204749966.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_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 5456 bytes
SHA-256: 1fb7c054944562792b6f5ed666d470cbb8283d9cc541d79bd8b66e9e8eb56e22
font_01_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 10548 bytes
SHA-256: 7d61a123cab673beacd8ed7cc09cc4557a30bcca3bd9144fd1a6cbba34ac5f5a

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