Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5d4e800842e95d…

MALICIOUS

PDF

84.0 KB Created: 2020-11-10 22:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ea21d7ecdb68c4387197cfd6df6ddf88 SHA-1: 5c9ac3e59aacf4dfa05bba79f6d54919ae294b21 SHA-256: 8a5d4e800842e95d0ecc72d09941641e89df9f539f54020c0e113f0ab465d434
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://traffking.ru/strik?keyword=guide+to+crystals+free+pdf PDF link annotation
    • https://laguwiba.weebly.com/uploads/1/3/4/7/134719839/938bab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_5f8f42204fc85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f8e1e5e86d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f8d2c65dd444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f91ae7f94110.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/5b300b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5fa06b3949ce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_5f8f60df5ecba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471686/normal_5fa7ecdbc2286.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/fd1c50cd-2e62-4808-89a2-3445375dbf73/wugewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1675f4-0824-4384-bd5f-a97fe5add1fe/36875638461.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/alistair_cockburn.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/fire_mage_leveling_guide_classic.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/girlfriend_activation_system_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/kitchenaid_owners_manual_oven.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_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 5280 bytes
SHA-256: 0b124a0df511ccb2c577fa4cd25c2ee45ee86ccdc6c225f01b8cd74d0c6fe816
font_01_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 10836 bytes
SHA-256: 1e6b985a6c937c42f8a67de19961882c850e847da98258f621466546d6f8af6e

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