Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e05074bdc18d5bc…

MALICIOUS

PDF

96.4 KB Created: 2021-02-17 18:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d8809ae02a8071a939c2060331392d3b SHA-1: bdbefc4835564d72532d37b91be30d9e20f05ab9 SHA-256: 3e05074bdc18d5bcf38bd79ef1fdbb6e148bda41b771dc3b4f7cb798486d5523
186 Risk Score

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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=craftsman+yts3000+parts PDF link annotation
    • https://makirogu.weebly.com/uploads/1/3/0/9/130969002/wodebaj.pdfIn PDF document text
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/8859760.pdfIn PDF document text
    • https://cdn.sqhk.co/tosijoxopum/1gcDZ0Q/88569305463.pdfIn PDF document text
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/nasixofe.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/ixjd5ge/78446265104.pdfIn PDF document text
    • https://dijamolilum.weebly.com/uploads/1/3/5/3/135347404/2775055.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/7487290.pdfIn PDF document text
    • https://nimimetifav.weebly.com/uploads/1/3/2/8/132814674/vetevesab.pdfIn PDF document text
    • https://cdn.sqhk.co/rijunawep/jifjcqI/zenalepegedodudiku.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/P5lifgg/portable_soccer_dx_full_version_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lozosasuxe/jrig56o/business_development_strategy_template_doc.pdfIn PDF document text
    • https://limotesatax.weebly.com/uploads/1/3/1/8/131871768/d82c1e7bf.pdfIn PDF document text
    • https://dewuvibemezifo.weebly.com/uploads/1/3/4/7/134763410/654ee4b.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/625f9.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/moduxanakuri/rerusogupujororefi.pdfIn PDF document text
    • http://foraxukesog.rf.gd/gantt_chart_excel_template_microsoft.pdfIn PDF document text
    • http://badubitoj.epizy.com/rearrange_the_sentences_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/kegososofokularemuvi.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_off00013c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C34 5328 bytes
SHA-256: eb63317f8c6abd0deae3779e5984645e7a1d5a47052509fd5e9df3cb809f7ee0
font_01_sfnt_off00014e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3E 12204 bytes
SHA-256: ec21a1f1974d32d5412f0593fe8050c5d27c15489156573b1bd98a5b449ce499

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