Malicious PDF — malware analysis report

Static analysis result for SHA-256 109fe8382ef82548…

MALICIOUS

PDF

62.8 KB Created: 2020-11-16 18:21:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7c9a8903ee50b46859e55fb03ae9ebaf SHA-1: d682ff4dfef2c289b37aaabdc40923b18c33acee SHA-256: 109fe8382ef8254860397ab47fab2e932dec7ea8ad5fafb5903d2b7ffcec9d73
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://traffset.ru/123?utm_term=head+tennis+barber+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375071/normal_5f8faede33bca.pdfIn PDF document text
    • https://vafuxukosa.weebly.com/uploads/1/3/4/4/134440110/5b0ab44579.pdfIn PDF document text
    • https://tobuzedatenet.weebly.com/uploads/1/3/4/3/134322281/4971233.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/advanced_trainer_cambridge_download.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/artifacts_in_radiography.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/huston_smith_the_world_religions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd97e80-7542-4a71-8d26-9b5a51f9c811/estados_de_mexico_mas_afectados_por_covid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15547210-69e1-4999-93c8-3478224e1d42/luvalarimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d43ab0-4016-4c99-817f-7740480fb4b5/bojovezadeb.pdfIn PDF document text
    • https://s3.amazonaws.com/mewezekilafef/barratry_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e340c8f4-21f6-4c17-85b3-128bddbd8b16/87786975006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39fcbd3e-0635-4749-b702-2798b6edd57a/24666791210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0629ed2f-f0d4-4862-ac32-a917e2b82cec/lewagixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77de5eca-fa2f-477b-a407-7aa66dc6dc2c/25933150332.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_off0000a9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9DF 4892 bytes
SHA-256: 8372ce344c67cb8cebe2494cae550a1dab32419a333e6c911c8789b8f3c32335
font_01_sfnt_off0000ba53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA53 11960 bytes
SHA-256: 5401b08a9ccdb9b883c75cdb4a77fdcd0a877c1edaef626876587790b230dc56
font_02_sfnt_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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