Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb31673be74af1f…

MALICIOUS

PDF

73.9 KB Created: 2021-02-21 00:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 25e3024b7a4523edfed87e72c14297de SHA-1: 751154eed13fe1970fd32f9b7bb3880fcd6a2da0 SHA-256: ccb31673be74af1f3428b6e244e279290881f75ddc56d1177912fe80600bc238
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, suggesting an attempt to direct users to potentially malicious websites for phishing or SEO spam. The presence of embedded URLs and the PDF structure indicate it's designed to exploit users' trust by presenting seemingly legitimate content that leads to external resources.

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://jacksth.ru/strik?utm_term=what+is+ap+mode+and+repeater+mode PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459636/normal_5fe50beb1cf2e.pdfIn PDF document text
    • https://gefumugizifoz.weebly.com/uploads/1/3/0/7/130739155/gobaf-jekujabegizepe.pdfIn PDF document text
    • https://tesudegijalel.weebly.com/uploads/1/3/1/4/131438759/rakutal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_5fd2339176473.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/rikomivevezisiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404123/normal_602edb742a736.pdfIn PDF document text
    • https://fizexafotunuguv.weebly.com/uploads/1/3/1/0/131070009/5896423.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368952/normal_6004ade330232.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5fc69d8cb6c59.pdfIn PDF document text
    • https://taxefijiduru.weebly.com/uploads/1/3/5/3/135311915/8583953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501509/normal_5ff6596e77887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407664/normal_5fe5455725649.pdfIn PDF document text
    • http://fisogik.iblogger.org/75320877822.pdfIn PDF document text
    • https://toxobeveja.weebly.com/uploads/1/3/1/4/131437160/4918128.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wokobunowome.epizy.com/45832583097.pdfIn PDF document text
    • http://murejusugu.epizy.com/sebomivemidit.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_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 5180 bytes
SHA-256: feea3363a44e3805e91b2b3e774dbeafb057f0d682b08bd315fa69b7e5269925
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 10208 bytes
SHA-256: 35b949c2148782cc36ed62cee1c9411b6bee994693d0ee8e6bfded03240cf3a5

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