Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b40e82e6c92f891…

MALICIOUS

PDF

79.6 KB Created: 2021-02-03 19:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: dfec6adfae831b60b21abb16026ed8c1 SHA-1: 7964ec5d4cde1cdedd222e7f99c463b5fc881d77 SHA-256: 1b40e82e6c92f8916255d6308b3e9211a4bd6a12d596f714d9f62c23017ea48b
186 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 disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content or phishing sites.

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://jacksth.ru/123?utm_term=what+is+a+phosphodiester+bond+in+biology PDF link annotation
    • https://cdn.sqhk.co/pasivuzuke/hi5gghf/mini_boxing_gloves_bulk.pdfIn PDF document text
    • http://xuzudedol.22web.org/fraser_institute_economic_freedom_report.pdfIn PDF document text
    • http://bapipakaroxi.22web.org/cbeebies_storytime_app.pdfIn PDF document text
    • https://cdn.sqhk.co/dovewobojeb/8ib3haH/25271667619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_5fe652f682c46.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/ieh4jiR/72923162017.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/f313660676461.pdfIn PDF document text
    • https://jupaxegusuwe.weebly.com/uploads/1/3/5/3/135389123/suluzerodot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387412/normal_5fcdd51e36059.pdfIn PDF document text
    • http://mavurelaro.22web.org/ignou_date_sheet_dec_2019_ba.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/xojajemubu_sopopej_forasinozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_6017353b2dbae.pdfIn PDF document text
    • https://cdn.sqhk.co/xezakomujar/E4igqNF/love_test_calculator_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molegidotisi.rf.gd/test_graphics_card_performance_windows_10.pdfIn PDF document text
    • http://jetelusaxidu.epizy.com/asmaul_husna_dan_doanya.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_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 5476 bytes
SHA-256: a0bb1db08d7ca5fb9dc677edb749d90721d19495b6b58925625350f1160abfe6
font_01_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 11556 bytes
SHA-256: 73c7db7c8e9445a5be429a33b99346961620c56077fbb648278e9213a63f3f49

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