Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7fad052004873d…

MALICIOUS

PDF

71.5 KB Created: 2020-11-11 09:19:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 129dffabd94e973cdb9b204b523737f1 SHA-1: d3eff08964d988ad5ec5825fa0a9704505a7906c SHA-256: 2b7fad052004873da838c16aad1eb9e17d4c4d7d84169974deb5bed5c90d0c80
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 0.9997

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://traffking.ru/123?keyword=senior+capstone+class PDF link annotation
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/0a16ede369.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/gudag.pdfIn PDF document text
    • https://bufetokarad.weebly.com/uploads/1/3/4/0/134096279/4890206.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fesixukorupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/pomogopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3866cab5-0322-463d-a579-cda61e063c2d/the_cast_of_the_legend_of_korra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b037307-04e7-4228-9ec6-7e315920540c/1967378522.pdfIn PDF document text
    • https://s3.amazonaws.com/vibove/mountblade_warband_tweakmb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce5dc30-e5d5-49b1-a579-aa317803eab3/historical_thinking_skills_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71da9d6-8d4f-4a13-b304-06cdaa30efda/star_wars_the_last_jedi_wookieepedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d675b5-eeed-4457-99a4-37dc1847a76e/reset_computer_password_hp_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/99486799978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e0e798-9c0d-401e-bc03-c6c26fc96e8f/73895610172.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB5 3312 bytes
SHA-256: cb5c8c6405a97e289a1d37fd8f3fa0fb9a9e5cd02c3f475be668e5c7f8c23a8c
font_01_sfnt_off0000db96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB96 5032 bytes
SHA-256: d3bd18561ce56cb3735132e3f86c265a178479501391d2566e2965c8e585f969
font_02_sfnt_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 10732 bytes
SHA-256: 7ff3ff44d7991b854bb7e7db8e923970be3d4f98a42d7b299231a059164ee6c5

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