Malicious PDF — malware analysis report

Static analysis result for SHA-256 9661b7c8da60345e…

MALICIOUS

PDF

78.1 KB Created: 2021-03-02 13:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 00eb62aca29c43c4bd34d24c8745b914 SHA-1: 75740b935f8ba90c7bd95e0fd5abc37ec351b152 SHA-256: 9661b7c8da60345e476fbc8bc8c820bdd41b0d31e94878e52ccaf1ed804c1422
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file exhibits multiple indicators of malicious activity, including a malformed stream length and a high ML classifier score. It impersonates Microsoft to lure users into clicking a link that leads to a credential phishing page, likely to steal user credentials. The embedded URLs suggest an attempt to distribute malicious applications or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/676184.pdf.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jottigo.ru/wix?keyword=game+hacker+apk+free+download+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444852/normal_601a2a5ec770a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473403/normal_6002704abf954.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/676184.pdfIn PDF document text
    • https://zavegikow.weebly.com/uploads/1/3/4/8/134884987/jobutotapu-kenezujolijuvej.pdfIn PDF document text
    • https://wisubewaxivi.weebly.com/uploads/1/3/4/2/134266733/35b0fd7.pdfIn PDF document text
    • https://fanazogi.weebly.com/uploads/1/3/0/9/130969494/7991975.pdfIn PDF document text
    • http://lotto-investclub.com/pico_to_chico61tqb.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/ghghjT1/apple_music_download_stopped_mac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_602bdd0fd2099.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/wibedubosateg/94320280056.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/63296699619.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/father_s_day_worksheet_for_preschool.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/jasper_reports_date_parameter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/canterbury_tales_prologue_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/museguxazawepometowodaguj.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_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 5676 bytes
SHA-256: 459a095f744a06da28936015ef505891a55652e31de9335e9e970793080e8dad
font_01_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 10916 bytes
SHA-256: 281a4044e5a6b79f18aad1475e8bdef2012060653616af253052104c2d7cc1b7

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