Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc5eb91169ce7b6…

MALICIOUS

PDF

74.8 KB Created: 2021-03-14 00:19:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3cdc00a761592164f3f34e8ad8e8fa01 SHA-1: 107d0a26bd4de1afd964a1aa5f1eada14337a785 SHA-256: bfc5eb91169ce7b6cb550ee871b31f25988ea23c74697291c7c6904fb2bc3e5e
156 Risk Score

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 0.9997

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 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://nipisod.ru/wix?keyword=concentrix+employee+handbook PDF link annotation
    • https://befojawukirafa.weebly.com/uploads/1/3/4/8/134855882/nufodexakave_witawalafefewe_jowinipipumofu_dufaf.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/hjiicih/classic_ringtone_download_mp3.pdfIn PDF document text
    • https://ginuzakonufa.weebly.com/uploads/1/3/2/6/132681862/443976.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/kodovosavesivirewaf.pdfIn PDF document text
    • https://suretilan.weebly.com/uploads/1/3/0/7/130738944/6691363.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/iZjiMge/mupakemafiduvak.pdfIn PDF document text
    • https://xesusilinani.weebly.com/uploads/1/3/0/8/130874458/pefovaze.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/djgxwhb/best_racing_games_on_switch.pdfIn PDF document text
    • https://kefomituwo.weebly.com/uploads/1/3/2/8/132815939/9653668.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/nezolasujivezokornlb31.pdfIn PDF document text
    • https://jodavetofa.weebly.com/uploads/1/3/1/4/131438562/8659729.pdfIn PDF document text
    • https://kumazapo.weebly.com/uploads/1/3/2/7/132710765/bireb-lusafifuteru.pdfIn PDF document text
    • http://qqkaxes.xyz/872207432474gswa.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/jijari/mixed_fraction_addition_worksheet.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_e0bb997247064c40bba9e4c13c8c1ce0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/66697852593.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/focus_group_final_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/wedetujibirezawiletexiv.pdfIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_2c3fd346ee5147d08c0c55381599d59f.pdf?index=trueIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_9013bc04d47348698c75fccdc5a5b15d.pdf?index=trueIn 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_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 5412 bytes
SHA-256: b67405c9cd78bbcf9f329c74f5450826ebf42921539d722cf74cff1661e3b5bc
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10596 bytes
SHA-256: b311242e7204689995aec6f7e428ea9a379a695c2ddb2dab705ef8e5919e7664

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