Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac87148f45543d48…

MALICIOUS

PDF

74.2 KB Created: 2021-03-10 10:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 322268e1832e7be372ead9e0587e68cc SHA-1: 4e8dda40cedb78ea495a4e8269789f5461cfe562 SHA-256: ac87148f45543d4886df6a01d06b107fc31605bceff51a30df4321f7d2af8726
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and the document body, though heavily obfuscated, appears to be a lure related to common household issues. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=why+does+my+top+loader+washing+machine+smell+musty
    • http://uscarins.info/big_mouth_and_ugly_girl_summary_chapter_16x153h.pdf
    • http://demask.space/ginewowozewab4va0.pdf
    • https://static.s123-cdn-static.com/uploads/4475854/normal_5ff8c0f78bb87.pdf
    • https://cdn.sqhk.co/nujamuxeg/gigghgi/function_generator_and_oscilloscope.pdf
    • https://cdn-cms.f-static.net/uploads/4391024/normal_6015ac8ca92cd.pdf
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5fd1d2ebf1c3d.pdf
    • https://cdn.sqhk.co/zupuguvawaj/jalgLij/bricks_breaking_2_game_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4386834/normal_603b179a7a7dc.pdf
    • https://static.s123-cdn-static.com/uploads/4424683/normal_5ff5c0a794e6e.pdf
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5fe0d866f04e0.pdf
    • https://static.s123-cdn-static.com/uploads/4367656/normal_5fd07bac928ba.pdf
    • https://cdn-cms.f-static.net/uploads/4390638/normal_60166d33602ed.pdf
    • http://hangookoil.ru/95494426912tc5n4.pdf
    • https://cdn.sqhk.co/zegofurop/ehigYYS/95276286461.pdf
    • https://cdn.sqhk.co/ketalidukepi/IHib5jc/2415820055.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1ebf299b-cae8-44b1-84a4-3be3c880d686/financial_peace_university_app_review.pdf
    • https://uploads.strikinglycdn.com/files/78c58cd6-ef8a-4ece-9f8c-044c28b8ce90/34777818364.pdf
    • https://uploads.strikinglycdn.com/files/aa5a1861-987d-4bf9-bd9a-d6e33540de26/61071731569.pdf
    • https://s3.amazonaws.com/xujitezu/install_aptoide_apk_for_pc.pdf
    • https://s3.amazonaws.com/wizuluworafid/rekugawelovigumim.pdf
    • https://uploads.strikinglycdn.com/files/b089786d-45a2-4754-8b58-da3138dbdbd6/how_do_you_write_a_running_record_observation.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3aa.bin
3b97786a9fcddc14ef05c82545d156d44e597e9d428dc06fe49355083776790e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 5696 bytes
font_01_sfnt_off0000f6fc.bin
5661f28b803756e00315cae3349dd485f5b0ddde30a46765c576cd40b0d4ec0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 10748 bytes