Malicious PDF — malware analysis report

Static analysis result for SHA-256 86be634f104c42ce…

MALICIOUS

PDF

74.8 KB Created: 2021-03-11 16:16:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: effc5699b2a5c131acbdf5c975478de5 SHA-1: 92a6072b82e533a031ddece20f14afc93a31ccc7 SHA-256: 86be634f104c42ce265453fdf31cf5dad4e0709af25629043b3e64e19d51476c
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 0.9991

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://nipisod.ru/strik?utm_term=the+metabolism+plan+results PDF link annotation
    • https://cdn.sqhk.co/mezugifosa/Znyf2E9/hindu_paper_horse_racing_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/jgsfijg/99344275797.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/6gljick/44651116277.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/iajfKIS/jikodog.pdfIn PDF document text
    • https://cdn.sqhk.co/mebinolopuf/FBggLij/sarexugexumixifup.pdfIn PDF document text
    • http://samawonuveweg.22web.org/me_before_you_review_phim.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/18848407997.pdfIn PDF document text
    • http://rukusitotelo.iblogger.org/repubijunofalak.pdfIn PDF document text
    • http://topagut.iblogger.org/the_rock_cycle_worksheet_answers_key.pdfIn PDF document text
    • https://cdn.sqhk.co/wisisatofife/XY7iaUd/custom_ringtone_for_iphone_8.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuxedodi/jBxB7Zi/gaxuz.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/fjijgPG/46177234077.pdfIn PDF document text
    • https://cdn.sqhk.co/reteduze/fifijjb/tisiva.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/luworizesupox/83819086759.pdfIn PDF document text
    • http://wiwekunu.rf.gd/business_letter_asking_for_information_example.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/91186547247.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/zufimowetajezirada.pdfIn PDF document text
    • http://sunuwib.epizy.com/ammo_67_final_exam_answers_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/69710928596.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/24068130311.pdfIn PDF document text
    • http://tokeximu.epizy.com/ledinujofefib.pdfIn PDF document text
    • http://notalopelovawu.epizy.com/casualsusan_ref_sheet.pdfIn PDF document text
    • http://setiwol.epizy.com/25534921572.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/high_school_graduation_speech_template.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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 5148 bytes
SHA-256: 271f44e806e53d3d663659db2013a9ce0ab74210db76f13e062d0ce923fab794
font_01_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 10160 bytes
SHA-256: 64b15839dba86e97867d6a2e1af9946b7483b2811f529efbabf5aacaa1196c97

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