Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84ce993799b5c0c…

MALICIOUS

PDF

60.9 KB Created: 2021-02-10 00:13:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 73d3ed91bcc06daed527996565201566 SHA-1: 6ba3f3baaa9ff58a91218692ebe97cee5d31a502 SHA-256: a84ce993799b5c0c5baa460338361087817be5d8a8a63fb4159536bc2d25a745
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with a primary suspicious URL being https://jacksth.ru/aws?utm_term=blackstreet+no+diggity+instrumental. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed as a link farm on disposable hosting, likely to distribute malware or conduct phishing. No scripts were extracted, but the presence of embedded URLs and the link farm nature strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://jacksth.ru/aws?utm_term=blackstreet+no+diggity+instrumental PDF link annotation
    • http://lg-copyright.com/liparopotibytn9.pdfIn PDF document text
    • https://jifonoru.weebly.com/uploads/1/3/5/3/135316211/xiviwamuxa-dizemikeduzibi-jigunadipen-zafirof.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/games_free_kjv_biblef22tm.pdfIn PDF document text
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/dekujupokoresori.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/pexiku.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/67780188677amm5i.pdfIn PDF document text
    • http://hargotel.xyz/research_paper_on_online_marketingas1nu.pdfIn PDF document text
    • http://fastdonwload.space/3438115095791i0v.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/7115725.pdfIn PDF document text
    • http://edaruzal.xyz/mutiresikedu5gm4c.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/wexukufedepim/nedarepafamokinab.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/kidigafudovanijofigedipik.pdfIn PDF document text
    • http://marakolin.epizy.com/neteritajudikopi.pdfIn PDF document text
    • http://zuvetimimu.rf.gd/zonoguxo.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/jasezazama.pdfIn PDF document text
    • http://peforiroli.epizy.com/mozuwegodemizuwen.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/shutterstock_editorial_guidelines.pdfIn PDF document text
    • http://pexoroxijaseduj.rf.gd/jevulekole.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_off0000b24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24C 5476 bytes
SHA-256: c757fb346b663da44521fb295c156762f2d98aadc755b53db1668f003a2b174c
font_01_sfnt_off0000c4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E2 9872 bytes
SHA-256: c7906c88a3546d6637acf4dec680c7a963c7fcb899281a9bbd6df3bbd1d2581e

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