Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ff7fd8ac514708…

MALICIOUS

PDF

83.6 KB Created: 2021-05-07 13:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b53763ad17d055c7ec229e607b8d0084 SHA-1: 90cd01bdb495d26f9576393bb709ec512d90df0d SHA-256: a3ff7fd8ac514708b3f1eaed8098a7a099d2e4c5e4f80eb2709e359ac70c6c1a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://xezojetit.ru/strik?utm_term=why+did+fredo+get+killed+in+the+godfather PDF link annotation
    • https://cdn.sqhk.co/nedupugifuka/agdLzv8/cube_defense_path_11.pdfIn PDF document text
    • http://roboludawu.mywebcommunity.org/fipotug.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/idUo7he/admin_template_bootstrap_w3layouts.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/wDhegij/rabegogatizudezovuba.pdfIn PDF document text
    • http://mivegik.mygamesonline.org/nefidikezako.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/articles_worksheet_for_class_5.pdfIn PDF document text
    • https://cdn.sqhk.co/pikukafil/2Ewjaje/wirosanefonif.pdfIn PDF document text
    • http://vixemifojetinag.sportsontheweb.net/calculus_early_transcendentals_7th_edition_answers.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/66280370022.pdfIn PDF document text
    • http://wozuxel.getenjoyment.net/cetoacidosis_diabetica_pediatria_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/gcyjfFi/evoland_legendary_edition_gameplay.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/fatikonavori/chargesheet_movie_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/blues_scale_guitar_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b2a876-dadc-435f-88f5-bcd93c842362/wobuwir.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/the_adventures_of_sherlock_holmes_series_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85b454d-4403-4322-863b-5989625d0527/tadagunasapapadekejajavif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5621ec56-3b0e-4d49-acdd-12094a09925f/lebiboripinufaka.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/how_to_rig_a_pole.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/administracion_de_medicamentos_via_rectal_concepto.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_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 5168 bytes
SHA-256: 1d7f16ba9d4ae6967ab44779f6bd4c441e14622a16be165d05201fa6381e2c61
font_01_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 10300 bytes
SHA-256: ad094a5030a4d7cfea3ee2c20e67faeab1cc6b6efb00dd73fe5d5c81cc4046eb

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