Malicious PDF — malware analysis report

Static analysis result for SHA-256 15405b7d9080319d…

MALICIOUS

PDF

76.7 KB Created: 2021-02-15 14:19:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 76975c0b9aaf9cd39f40f489cf587bbd SHA-1: d807d7c43375f9f5a9a3f4338068388346d01c57 SHA-256: 15405b7d9080319d1e50cdd17be1254b1de4450d2d19b1c7005331f2a9311565
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' and disguised with a CFA institute exam weights query parameter. Heuristics indicate this PDF is a link farm hosted on disposable domains, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. The presence of embedded URLs and the link farm nature suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/aws?utm_term=cfa+institute+level+2+exam+weights PDF link annotation
    • http://wuvigirigu.22web.org/bipusoparepokolasufu.pdfIn PDF document text
    • https://tizusetupo.weebly.com/uploads/1/3/1/6/131607013/7707849.pdfIn PDF document text
    • https://tebebutak.weebly.com/uploads/1/3/4/7/134744698/foleremugepitug.pdfIn PDF document text
    • https://fotelixufigowex.weebly.com/uploads/1/3/1/0/131071188/ludib-mekizefip-lukerepijop-vijegoduzerare.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/lLChjHU/free_robux_counter_and_calc_2020_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/ijfrxja/kuvokatamepimoji.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/ropudegelaxun.pdfIn PDF document text
    • http://balewezekowesab.iblogger.org/laser_a2_workbook_answers.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/7e803274c.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/jggiWae/merinadesewerutulowojito.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/ihhggjE/slot_car_track_braid_australia.pdfIn PDF document text
    • http://xufegabuxugil.iblogger.org/7511085827.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/gZpF5al/ear_doctor_specialist.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/teximikamukubo/mini_milk_carton_box_template.pdfIn PDF document text
    • http://jitapalerex.rf.gd/granny_pc_emulator.pdfIn PDF document text
    • http://pujukejesoteja.epizy.com/56410538643.pdfIn PDF document text
    • http://fisemofo.rf.gd/wenelidozonumoxesagifen.pdfIn PDF document text
    • http://tegofiv.epizy.com/software_house_ccure_9000_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/54792520891.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/offer_and_acceptance_definition.pdfIn PDF document text
    • http://rosoxejib.epizy.com/notutasirel.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_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 5344 bytes
SHA-256: 6191bc54195d03113e276caae9fa2f31c4550a5197b9099b76b80365cc477ac6
font_01_sfnt_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 11368 bytes
SHA-256: b08145d8d1bbaaccb44adc5577b241ec4312cfecbddf4e767b0a52da03ee19e3

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