Malicious PDF — malware analysis report

Static analysis result for SHA-256 8caf3a20df0ec852…

MALICIOUS

PDF

72.1 KB Created: 2020-11-28 05:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c68b0c28e9fb120084c62fcf7f389740 SHA-1: d403f0e4f86326f2f38024fb69d2d0989ffd9288 SHA-256: 8caf3a20df0ec852bb720c583e2566f73745d9a3d0a64a77e58cb9a464daeb98
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://trafffe.ru/123?utm_term=ds+2019+expired PDF link annotation
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/733328.pdfIn PDF document text
    • https://tanutefezuje.weebly.com/uploads/1/3/4/4/134437554/3572021.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/kusiwupobite-gumaviwuboniv-bopuvalamidiw.pdfIn PDF document text
    • https://rodekimixew.weebly.com/uploads/1/3/4/3/134314341/a82be031d00db.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/4cb5795817126.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/4b779c32-a7ce-4f5f-8ebd-5282339d7972/crepusculo_2_pelicula_completa_en_es.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/xawobotiviz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f406fe-62ba-4904-a3b2-9a353e5cb99e/persepolis_marjane_satrapi_downl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc7b860-864d-4919-8f20-1284253f2a16/58001549750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38611f64-9cd4-4a61-afbc-f224d585fafe/factorizacion_de_polinomios_ejercicios.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/botim_apk_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/megedilima.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/9957287928.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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 5260 bytes
SHA-256: 9d0c9c61051b22863d3c247c2fd41bf6f60e0477ab9f73170801a847fbc473bf
font_01_sfnt_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 10564 bytes
SHA-256: e76e0edb2690d3e663e9ae41358497f7fd56310b9b7eee79c6bc1cadd3cccaab

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