Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2b07ec8a5bc7bc…

MALICIOUS

PDF

68.0 KB Created: 2020-12-01 11:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c3a18b8483c5d12e1653edc621ae05a3 SHA-1: 5fc68b9400cb8a828550f9f86d8c73b63b127839 SHA-256: ef2b07ec8a5bc7bcf2a6b40b49b99fbdf2d8a076a5185b6d89caf1652c452be7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical finding for a 'PDF_SEO_LINK_FARM' and ClamAV detection as 'Pdf.Phishing.Trojan'. The presence of numerous external links, many pointing to PDFs hosted on file-sharing services, suggests a coordinated effort to distribute malicious content or redirect users to phishing sites. The ML classifier output of 0.999735 further supports the malicious nature of this file.

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://trafftec.ru/aws?utm_term=apps+anonytun+achi PDF link annotation
    • https://gimepofu.weebly.com/uploads/1/3/4/3/134365645/jexubemusu.pdfIn PDF document text
    • https://votuwokikinoso.weebly.com/uploads/1/3/4/4/134466575/3634192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446776/normal_5f9f5ca1c389d.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/1e9fa5b0-cc6f-4bc7-be09-eda5fe355b5a/hell_let_loose_artillery_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/909b8e82-9a81-45b1-8466-9c3f5c45d78a/3516272082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e94aa13-183e-4c4c-aa5f-7546dc3972fc/parogidopinem.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd56316f6d44b07b8b81c/t/5fc132fd3c02f22b9d388949/1606497022237/sas_4_apk_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804754bd-2456-4589-a40d-d6be15ba4c44/41844437639.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0bdb9b1ed03538a1df5e/1606290396117/single_sales_objective_blue_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e277e00-6ef8-493a-9f38-eb09db8ee500/literary_devices_in_fast_food_nation.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d4c78139af037644e8c4/t/5fc15b901972c46e3cd19360/1606507408976/lipatoba.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_off0000cf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4A 4984 bytes
SHA-256: 60d4e272b8cfc8189fc64a04d289377df29c039556ab24c0541119ac68d998b6
font_01_sfnt_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 10452 bytes
SHA-256: 1ac4748d12be0ef09a528a8c383820ca2d4d4d12398af6d0411c454e0bc89dd4

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