Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc6667b73b536b5…

MALICIOUS

PDF

66.0 KB Created: 2020-11-13 23:59:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b40e1fe091d4222cabeaefd3838f41ea SHA-1: 19277f100b3e89307717221c934fb0e53b0d2d74 SHA-256: 3bc6667b73b536b5b3c67ed3dae4a13155ed63644f1fe44d409418dd9a378c6a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious websites. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicates maliciousness. The embedded URLs suggest a phishing or content-scraping attack pattern, likely delivered as a spearphishing attachment.

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://trafficel.ru/aws?utm_term=pro+calcitonina+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408981/normal_5f938852ebe6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_5fa3b62e5c38b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_5f91bb870805c.pdfIn PDF document text
    • https://zowupenejanelaw.weebly.com/uploads/1/3/4/3/134397621/5241323.pdfIn PDF document text
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/693eb414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5fa7b4548cf6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427295/normal_5fa038890df21.pdfIn PDF document text
    • https://mavepokakep.weebly.com/uploads/1/3/4/6/134628520/fb0e1b06.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/sesovubesujigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421208/normal_5f9dbaa00c7ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_5f92fbf5d6405.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/vemegarobema-xinexolo-gavegomavaxovow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/watch_online_movies_frozen_2.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_off0000c621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC621 4972 bytes
SHA-256: 23d94b99365623a64d8b2fa75714fde932db10188342854a1bdf5777694ed2e6
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 10828 bytes
SHA-256: cbc8b594e58c36d5516ebba271c08b2de1f44783e1cdff0f697cf6ad78825e68

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