Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a162dc0026ec41e…

MALICIOUS

PDF

69.8 KB Created: 2021-04-30 19:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dd621f4759a69a6e03bdcc7dfce9f28a SHA-1: deba2e73cc127e27a6f669864db9349b2471859b SHA-256: 8a162dc0026ec41ebf1a119b3e1b141442b5a08c95ba4e44b25231d25336c80d
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 0.9998

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://druttle.ru/strik?utm_term=what+is+in+bob+evans+sausage PDF link annotation
    • https://lafikekil.weebly.com/uploads/1/3/4/3/134316660/xomosud_zigubegijibak_zujozuwisud_navofexavumone.pdfIn PDF document text
    • http://tadiminag.22web.org/effects_of_luba_lunda_migration.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/refaw.pdfIn PDF document text
    • http://piwusipiraxal.22web.org/24001541963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_601b395d52f36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426832/normal_5fc91a442b6e1.pdfIn PDF document text
    • http://lakufakatoj.iblogger.org/blackjack_table_for_sale.pdfIn PDF document text
    • https://kuxoredekudo.weebly.com/uploads/1/3/4/3/134368385/c511d24.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/nefunupu/mitel_5312_ip_phone_voicemail_instructions.pdfIn PDF document text
    • http://binefiwir.rf.gd/accounting_word_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/graphing_piecewise_functions_worksheet_with_answers.pdfIn PDF document text
    • http://weregoxo.epizy.com/convert_binary_file_to_online.pdfIn PDF document text
    • http://vidokewokesun.rf.gd/55303373106.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/guzavagudikukagiriputa.pdfIn PDF document text
    • http://nebegekiguwipaz.epizy.com/beyonce_coachella_performance_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c7eeb2-2f9b-488b-9820-22fbde8a155b/bokonipafugijox.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/monster_inc_characters_randall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7be3041-9a02-4909-b2c1-162165630d88/can_i_have_a_dating_scan_at_6_weeks.pdfIn PDF document text
    • http://fapibudu.epizy.com/35934235515.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/magnetism_quiz_questions_and_answers.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_off0000d396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD396 5032 bytes
SHA-256: 5bd57a19b44cf44cc86fde115fe87f63526963e92401877d24d4b2d6b1220d68
font_01_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 10860 bytes
SHA-256: 0c97e909c178a25ee196bdd0ea4221df0663a2ea05e7b52ff46d3ab140097d4f

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