Malicious PDF — malware analysis report

Static analysis result for SHA-256 5561e4ab325b0798…

MALICIOUS

PDF

82.3 KB Created: 2021-03-31 23:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4ef2e5085bcf7a4a801932ed7bc0f564 SHA-1: 17dbcd34f07ad12628046fc76e502d98c857b87c SHA-256: 5561e4ab325b0798ab34afd46b333713af03f88dfb3a8cc54ee26c81238ed342
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or scam attempt. It contains a large number of external links, many pointing to PDF files, suggesting a link farm designed to attract search engine traffic. The primary malicious URL identified is pelibifir.ru, which is likely used to host a phishing page or download further malware.

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://pelibifir.ru/award?keyword=cereal+magazine+pdf+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373753/normal_600312a325252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_603e651603c22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387232/normal_5ff1bbf81aae1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494891/normal_5fe2faa7abe36.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/notuki.pdfIn PDF document text
    • https://rilulozopofebu.weebly.com/uploads/1/3/1/4/131406258/levil.pdfIn PDF document text
    • http://xovonakajo.22web.org/histologie_de_l_appareil_urinaire.pdfIn PDF document text
    • https://sitobewabaxepok.weebly.com/uploads/1/3/5/2/135295681/8109450.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/9e49b.pdfIn PDF document text
    • https://bomegudezami.weebly.com/uploads/1/3/1/0/131070148/2202861c1aa64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495240/normal_6025cad091971.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470533/normal_5fe113036d9aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385009/normal_5ffddefe129a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_602ce0f119c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401519/normal_6059bb6850f9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jozapatoxijoraw.epizy.com/22287169718.pdfIn PDF document text
    • http://jevitafobu.rf.gd/57089817883.pdfIn PDF document text
    • http://lukoleni.epizy.com/ivy_global_new_sat_guide.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_off000103fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FB 5140 bytes
SHA-256: c17620841b44373f912cb996e309c2eda046d833201ce817cfa2a3827420cf2a
font_01_sfnt_off00011567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11567 11548 bytes
SHA-256: bda1ab240fbe3b3a28c4c3420c079120c8e92efe3e9721fd23cdbbe201eed0f8

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