Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d2b3e3ec522f96…

MALICIOUS

PDF

70.6 KB Created: 2020-11-17 09:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a70b554e8d1d7dd5854d7b2d6f850fa4 SHA-1: 9ceacaa13bc38ff0723a3beffa8d8f9184bf9a35 SHA-256: a0d2b3e3ec522f96ae505f3d9d2b77b3e65282a905d2e26e077295d8c9de77d8
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-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://trafffe.ru/123?utm_term=wee+sing+in+sillyville+cast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416149/normal_5f9d82cf021b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_5fa5b59bae1a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5fb259e544559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f8b42257fbd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_5fb03f500e805.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/4265599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_5fa2a18020913.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/72459d96-22a9-46d0-b2a1-d318dc6a3f9b/3516008158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3703016b-ea8b-4390-825c-9524bf3ef380/22930822120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/720a0ff9-625f-4ee8-b749-d8e24f65ec84/mibudojewakuneme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1864bb-f5dd-44ed-ab1b-ceb37fd55106/97500517071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c21170-d995-4927-989c-f2e6c52aef30/fivezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44a5257-0aed-436c-b239-096025665e7b/wepopefovapovotexovupix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33f274c-cd45-4c66-b6ae-2e4e7d896be6/xiniwovobapetir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bbe67ab-ef4e-45d3-bccf-e5e80eb7ccc8/top_10_lenses_for_550d.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_off0000c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 5044 bytes
SHA-256: e62971aa02fae1dde357ef46f48d8cf1ee260aa773eea1b7d9e427815119e299
font_01_sfnt_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 3304 bytes
SHA-256: b43a185ae8744969b97e7931be03bf7b1075c008d490ab19a27d733f37a51255
font_02_sfnt_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 11572 bytes
SHA-256: 9c0b6609e6ee7b917374cd0a0f6efc14b345c40c4be342b5c16dea068baa93ba

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