Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6325a2ade34a7d3…

MALICIOUS

PDF

77.3 KB Created: 2021-05-25 14:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cbd77253aef4ec36d1f9d6263f2dd229 SHA-1: 28917d410460050e6797d5d9ef496e3fac39d42f SHA-256: e6325a2ade34a7d321ae7fea5d3868806a26d5635eff484d8f2af6465e8edf16
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or phishing operation. The primary URL, https://kuzutuzo.ru/strik?utm_term=music+mojo+season+4+mp3+songs+free+download, is presented as a download for music, likely a lure to direct users to a malicious site. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

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://kuzutuzo.ru/strik?utm_term=music+mojo+season+4+mp3+songs+free+download PDF link annotation
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/9348636.pdfIn PDF document text
    • https://gawopina.weebly.com/uploads/1/3/2/8/132814119/likuporabukolazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_6047a3de8b0b7.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/nizuzolezowuvilef.pdfIn PDF document text
    • https://jobeluke.weebly.com/uploads/1/3/5/3/135318189/tilapazatarexez-weporadaga-kaluf-zovobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501645/normal_605d910a64662.pdfIn PDF document text
    • https://jozifopavix.weebly.com/uploads/1/3/4/3/134355896/powetanubinobav.pdfIn PDF document text
    • https://lotatodekimin.weebly.com/uploads/1/3/4/7/134705716/murariresevizof.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/6543821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482002/normal_5ff353e75fc36.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/werexebawojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_5fe756fb16c74.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/d0eed45.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/gudukupir/21653758684.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/bayesian_methods_for_hackers.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/52450182125.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/66776802306.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/scattergories_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/18979507766.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/nefotexakeged.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/mejenulamaponeju.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_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 5900 bytes
SHA-256: 08e1933fa78e06dae8860d014782c37eb430b983c503bfcdd67bd47ea9525852
font_01_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 11520 bytes
SHA-256: b82472b8b710e346c6c7496c5e4958c848402ebd6d94387d6822ded3c74bc3f6

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