Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11206428d85685e…

MALICIOUS

PDF

85.5 KB Created: 2021-02-04 10:19:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8dff9b7263e5cafa0904ad48379c7ac6 SHA-1: 07d5d77136fa584b6baae69d8c5edfe375906c33 SHA-256: a11206428d85685e113a005a7411f5729248b7f289d113516c0ac8e4daf18af9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, which is indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing. The primary malicious URL identified is https://jacksth.ru/123?utm_term=owners+management+company+ireland, which is likely used to redirect users to malicious content.

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://jacksth.ru/123?utm_term=owners+management+company+ireland PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5fe07fe48b03a.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/WRghnjg/66884681890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501965/normal_5fcdf36126329.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5fec83873e567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_5fd31144cdccc.pdfIn PDF document text
    • https://tipuvativojodud.weebly.com/uploads/1/3/4/7/134754547/guguravutob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459937/normal_6003a4b447dcf.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/Xfzijjc/dunk_n_beat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448550/normal_5fe56962b0e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_601a2c4438873.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/gewisetug/13105691913.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/65026418010.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/animals_lion_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/zafemupevewebepojanebebu.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/65962482876.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/charisma_sheets_costco_microfiber.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_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 5612 bytes
SHA-256: e251c3eabed1bda0457c05a7f2499595c5d2e3aa4d50a8140fc2b48b134daad7
font_01_sfnt_off0001224e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224E 11456 bytes
SHA-256: a33c745db5188e20775ce0253c7078d092830fa919f3ae5e932a0a3114a3038d

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