Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e73b8b710c13f6…

MALICIOUS

PDF

80.0 KB Created: 2021-04-17 20:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b17da675013891506e79ca1e06eed7dc SHA-1: 83444fa98000d0d331a5a811f5bdeb80071f58f2 SHA-256: c8e73b8b710c13f67d91070c34ed7211740301338d6b828c56ee7eecadfab758
126 Risk Score

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 0.9994

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 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://jottigo.ru/strik?utm_term=getting+the+love+you+want+pdf+free+download PDF link annotation
    • http://pogadai.xyz/pro_fishing_simulator_ps4_trophy_guideq73r4.pdfIn PDF document text
    • https://zupufirelerige.weebly.com/uploads/1/3/0/9/130969681/nagit.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoroxur/1ulieic/20329024679.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/i1aR9Dd/castles_of_mad_king_ludwig_game_rules.pdfIn PDF document text
    • https://xurebutira.weebly.com/uploads/1/3/2/6/132681359/6944567.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/iAidihF/gamaxabosutezapoka.pdfIn PDF document text
    • http://menbp.online/fijigopaperocu6b4.pdfIn PDF document text
    • https://budigalaxob.weebly.com/uploads/1/3/5/3/135313384/zotolo.pdfIn PDF document text
    • https://neposuxanu.weebly.com/uploads/1/3/0/7/130740617/6216562.pdfIn PDF document text
    • http://zujoxuxosaja.getenjoyment.net/33946569831.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/ftlhgjd/boba_tea_near_me_open_now.pdfIn PDF document text
    • http://tryplafond.xyz/tough_interview_questions_and_answers_for_teacherszw2si.pdfIn PDF document text
    • http://tradestaroffice.com/one_punch_man_season_1_studiooj87c.pdfIn PDF document text
    • http://pubgmobiie.com/how_to_reset_toner_counter_on_brother_printer_mfc-7860dwubo6q.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/tajimipojimo/construction_estimate_book.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/834029322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a0306b-1a96-4668-947f-0bedf1eb27e6/the_complete_aromatherapy_and_essential_oils_handbook_for_everyday_wellness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d49722c-4112-4086-ab97-3c8c47c9aadb/gorosabuduxonopireruxi.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/bidala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca92763-f46f-4b3b-b144-ef291e6de9a8/which_book_is_best_to_learn_python.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/puraxarekulonidulikozej.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/faithful_victory_worship_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6694b5f-0dd6-4125-88fd-15932a4ba12a/jorupezeruxagisuwo.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_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 5408 bytes
SHA-256: 91eaae003c6fe1900d8e020b282d14ed3de015e7ca8989e27754398488cdf3a4
font_01_sfnt_off00010a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 11220 bytes
SHA-256: 7c85f03aadf07dc742ce5550667aed78146d3de75a160b5a74914ed236230261