Malicious PDF — malware analysis report

Static analysis result for SHA-256 609d34875528238e…

MALICIOUS

PDF

78.1 KB Created: 2021-03-27 10:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ef40ed77d6a8ad665b858b1a107ce409 SHA-1: 32fcc3322659d0b15e31a8b875db453882fafc95 SHA-256: 609d34875528238e6e8b4b42960a3dafd04f0dbc946cc00be112f85340df5f96
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to drive traffic to potentially harmful sites.

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://cdn.sqhk.co/bujerinalo/cxF1hhl/favorite_things_piano_sheet.pdf In PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/8322203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388413/normal_6029561a021d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494436/normal_60198fde80e8d.pdfIn PDF document text
    • http://vanesifonemume.22web.org/87575689988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_602a93c6010c8.pdfIn PDF document text
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/2d1a443c67aa2a6.pdfIn PDF document text
    • http://basofeveku.iblogger.org/budam.pdfIn PDF document text
    • http://nubebukexowi.66ghz.com/distress_tolerance_skills_dbt_worksheet.pdfIn PDF document text
    • https://litudawugo.weebly.com/uploads/1/3/3/9/133997631/mosen.pdfIn PDF document text
    • https://cdn.sqhk.co/fomolunuvufa/GgcuhjU/20219573685.pdfIn PDF document text
    • https://nafezukame.weebly.com/uploads/1/3/2/3/132302716/dde24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384480/normal_5fcf045269fb9.pdfIn PDF document text
    • https://xajibur.ru/123?utm_term=agave+americana+medicinal+uses+pdfPDF link annotation
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000f440.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000f440.bin)
    • http://delenujafoxa.rf.gd/75573650876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0bdb85-1c8a-4ef1-91b8-702c169e289c/que_es_un_manual_de_gestion_de_calidad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e5b3c8-af63-46fa-b2da-3a2f03da51a7/the_secret_book_review_in_telugu.pdfIn PDF document text
    • http://xurorovesi.epizy.com/50681071087.pdfIn PDF document text
    • http://walagujitukexa.rf.gd/tasif.pdfIn PDF document text
    • http://nimozan.epizy.com/37430088833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83fc2352-10c2-4059-ad25-8191b5c2f9f0/37475760312.pdfIn PDF document text
    • http://pepezuvizomu.rf.gd/online_aptitude_test_free_with_answers.pdfIn PDF document text
    • http://zujazeku.epizy.com/flip_flop_jk_7474_datasheet.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 extracted file (font_00_sfnt_off0000f440.bin)

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 5524 bytes
SHA-256: edb254d78d0afa532250dc23a14cccd965d4017ffa99b02c6786b5891bf1b4cf
font_01_sfnt_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 10640 bytes
SHA-256: 77f91be4e8e9355057996254eb928dd1ff0d262c26536299ded2819414e2d4e7

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