Malicious PDF — malware analysis report

Static analysis result for SHA-256 9675b7d52f16b690…

MALICIOUS

PDF

78.1 KB Created: 2021-05-30 20:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3142b5f11dce8aa3182b7722426d0795 SHA-1: 1752dde1d1c2a98d80b66cdc4000f9c68c8b5c1b SHA-256: 9675b7d52f16b6906e2f5ccf9ff9087fe8e1a0624f6e76a346a18181b2bf48e7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dugedepap.ru/strik?utm_term=respironics+cpap+adjust+pressure PDF link annotation
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/mebebakilozo-jinikuti-dugenipa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459464/normal_5ff9c54c705f9.pdfIn PDF document text
    • https://xuwejemeluk.weebly.com/uploads/1/3/4/3/134314543/vorelajevomajikubil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446633/normal_6002f1098ad17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476146/normal_5fcd7bf1e3e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5fe8a61d8408e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_602eedc247f8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_60392a7c1d10b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5fca0e27885d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412591/normal_5ff20999da12d.pdfIn PDF document text
    • https://rejigebejone.weebly.com/uploads/1/3/4/4/134462336/2058155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_60201a7b39b7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419650/normal_6004beeb1cbd2.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/d515a56b0699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393361/normal_6005f6d7e110c.pdfIn PDF document text
    • https://pujosudenavi.weebly.com/uploads/1/3/4/5/134508056/69c2e6.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/64e7ac25-671a-4ff7-90b3-249a6f089c34/45696845441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bdb0e99-3dae-43a4-a63a-e592a2d01f02/top_20_cases_of_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74ab2f4-a3f1-494c-b31c-974fa6884594/graphing_all_six_trig_functions_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b24187-9409-44be-b4e3-f0941f4756bb/lidositenemobimu.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_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 5116 bytes
SHA-256: 0dddd78ad96301d5e9ef1befaba87bbc768473e3f4c30c182c6fbdc2961ec16b
font_01_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 10860 bytes
SHA-256: 767ca022d1a9fd1d777e493369d397a44a52e075d246456eea894b67e9291467

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