Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f2393ef5ae1ef8…

MALICIOUS

PDF

77.7 KB Created: 2021-03-03 22:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f344cef339413b1e61d7f06d6b0abb94 SHA-1: 8e91d949d597ba1237223e39c678c1fc87864a88 SHA-256: d2f2393ef5ae1ef8ebe613fa3691178964e1093caa5e3a0557769ff8e25f61bd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=how+to+program+cox+remote+to+vizio+sound+bar PDF link annotation
    • http://goxuladajozi.22web.org/29886698995.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/charlas_de_seguridad_de_5_minutos_sobre_el_covid_19.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/formato_de_solicitud_de_empleo_para_descargar_gratis.pdfIn PDF document text
    • http://wiinorama.fun/vubetidokubonupetx9i8n.pdfIn PDF document text
    • http://fisusuwisefib.22web.org/calibrate_battery_android_manually.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/how_to_assess_for_anxiety.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/82086333832.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/zijevuwerazuvan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_6037565e6b623.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5ff13d2f4c347.pdfIn PDF document text
    • http://xijeboxebifariz.22web.org/western_digital_my_cloud_ex2_ultra_8tb_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_602f15307ee72.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/tumasun/vivaldi_bold_font.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/movies_apk_for_iphone.pdfIn PDF document text
    • http://xuresiru.epizy.com/admiral_stockdale_debate_snl.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/pool_car_log_book_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/2800372810.pdfIn PDF document text
    • http://xofuzugavup.epizy.com/refapinufojalojodizo.pdfIn PDF document text
    • http://taperimogitunal.epizy.com/bailando_spanish_version_song_free.pdfIn PDF document text
    • http://tabifewegijip.epizy.com/different_forms_of_alternative_sources_of_energy.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_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 5732 bytes
SHA-256: 48505832c20e2ffdefccd3ebd07384655e82b5b70f7120e7c47ece6181cb90fa
font_01_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 9928 bytes
SHA-256: 93b32e97a10c8937d1a371cecafc6c9430f227b4d9eda15f1477a6b45f0281df

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