Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76c38e3b7f0e70c…

MALICIOUS

PDF

77.2 KB Created: 2021-05-20 02:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b3f1353dfd0b886d7c2cbe466a5d2fd6 SHA-1: 1ddeefd8e2f2cd393f86b651f782cb29d275d096 SHA-256: c76c38e3b7f0e70c9cdd401715927461fceb4c22b8d9ba655c476061fbc2ed4d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9992

Heuristics 5

  • 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.
  • 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://midufefew.ru/strik?utm_term=unblock+website+vpn+browser+for+pc+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479474/normal_600149a9ab50a.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/8223aec464a10.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/2ecab5b3e0eafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414336/normal_600f7f948879d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482418/normal_5fc68f572879f.pdfIn PDF document text
    • https://wuwebiwurumebil.weebly.com/uploads/1/3/1/1/131164488/bb5c0cb5f0891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_602746981952a.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/paropabaru/how_to_know_igneous_rocks.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/sunbeam_electric_mattress_pad_flashing_light.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/penguin_readers_books.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/50483715594.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/18939928724.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/call_and_sms_blocker_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/sezafazubaloxepovadaruso.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/akeley_wood_senior_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/panasonic_kx_tes824_maintenance_console_software_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/rivavowisabezu.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/62866458243.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/process_heat_transfer_principles_and_applications_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/14776062751.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/sutisefukasavifegufiwusi.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/roku_3900x_remote_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/33231858925.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_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 5496 bytes
SHA-256: 5c44fbc54cd76f525535431d42a1c08c9c46c0499ddefaf8c23a914ff77f5279
font_01_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 11224 bytes
SHA-256: 2c96eec6b00c6b0d7cb407cfdc02bd86e09c6596f883f96c03b775b463fe867d

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