Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb52cd5cfdf1ae8…

MALICIOUS

PDF

77.3 KB Created: 2021-03-16 04:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 671e2b98e15cb2b4590834113b35e0d1 SHA-1: fd8461befeb3426739301ea36c3b1ed773760276 SHA-256: ebb52cd5cfdf1ae85f8bddeff9ea45ba7ed61263e2cb0a50eaf28c7552eed229
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the sheer volume of suspicious URLs suggests a phishing or credential harvesting attempt.

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://vilenefex.ru/123?utm_term=digestive+system+colouring+worksheet PDF link annotation
    • http://skywonder.space/how_do_i_find_my_apple_icloud_passwordyentb.pdfIn PDF document text
    • http://dragonflysagewellness.com/xominabidizj4fu.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/can_you_get_a_good_workout_on_a_recumbent_exercise_bike.pdfIn PDF document text
    • http://binisamekogona.iblogger.org/letters_to_santa_template_preschool.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/wapovebokanudasu.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/natawewuwovidibuxa.pdfIn PDF document text
    • http://worldworkbook.com/pepolerabiwafuzgknw8.pdfIn PDF document text
    • http://devicesprotectionforusers.site/risoxataxafabusojewd4hnj.pdfIn PDF document text
    • http://rirelavemug.iblogger.org/48425941240.pdfIn PDF document text
    • http://logvoz.ru/sample_bill_of_exchange_under_lcgsfxb.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/queen_azshara_heroic_tank_guidend8z7.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/68408196659.pdfIn PDF document text
    • http://xanejog.medianewsonline.com/53210771416.pdfIn PDF document text
    • http://lofitner.buzz/a_raisin_in_the_sun_act_1_scene_1_questions_and_answers2e0bu.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/carl_jung_collective_unconscious_example.pdfIn PDF document text
    • http://bioforce-co.site/why_is_my_edenpure_blowing_cold_airrhe76.pdfIn PDF document text
    • http://help-violation.com/how_to_play_slash_chords_on_ukulele2azkt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pizovusa.rf.gd/el_principe_de_la_niebla_resumen_capitulo_11.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/33017964525.pdfIn PDF document text
    • http://poxatita.epizy.com/diagrama_de_clases_uml_ejemplos_sencillos.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_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 5320 bytes
SHA-256: 9c00fdc4d5c95a7ffaed79292b3cd305828c424298c7996ad573da0cd4da4333
font_01_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 11320 bytes
SHA-256: d495f97490059d7e60dfe046a9443b15e0c94e3dea66a2d8f5fbbb6147b606cc

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