Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bff80b5f1e5cc18…

MALICIOUS

PDF

67.9 KB Created: 2020-11-17 23:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 585c80873693dbce7ce5f25a2c097d53 SHA-1: d8afcecf3b4eb143c7032e60d706f9557f96902e SHA-256: 8bff80b5f1e5cc18182222fe8561b76a88e81c0f5535840c51a58617512c8bb3
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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?utm_term=tevida+official+website PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379030/normal_5f92b0b41a210.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/sotewelid-nukawiduven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f877e531dc36.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/2564d1da-67a8-48e6-9117-19b151a974cc/40211784928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7acfc957-ac7b-48d1-83c8-7ed1305a3be7/92467247346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2482e24a-eb26-4eb0-9b3d-e33ab0f1a803/najotolunujerul.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/fupupedelelebud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce209a60-53b2-4885-86e8-78b4d6d1cf7c/codigo_j_fgts_pode_sacar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e4593b-d302-457c-975a-b7522cd4c496/71154173428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67cb2f9d-0634-401f-a1c7-3f68e2d76700/57842753420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e1a6c1-8fe0-4139-8558-c07a842441c0/harley_davidson_touring_service_manual_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168695d9-944f-4069-b50b-3cb6dbdf2c6b/human_anatomy_marieb_download.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECD 5160 bytes
SHA-256: f26dfd1b24135ef39a5e0ac0c372654bcdfc85ff2320cc80d12383bd3de9ce3e
font_01_sfnt_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 10260 bytes
SHA-256: c293f74ac0f9fb8f0232863bccb07e6bc8d96fee1f9e69ec76f59dcc8a5a2a04

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