Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bb90a5f299cbe0…

MALICIOUS

PDF

76.3 KB Created: 2021-06-01 10:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cc5d0d9f2efcf3a785d72d310c502611 SHA-1: 00a6bfb5771c8e645aba8d9e400c04ff132c9a43 SHA-256: 19bb90a5f299cbe0a2fabd53bcdf8d2fdd375ef3cf12d1c18fbe660872ed45e2
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://drafthe.ru/pbw?utm_term=minecraft+download+unblocked+at+school+jar', suggests a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://drafthe.ru/pbw?utm_term=minecraft+download+unblocked+at+school+jar PDF link annotation
    • https://lidobovinibun.weebly.com/uploads/1/3/4/8/134861857/zadiweri-jalezogame-menokitoj-vakawoletixubep.pdfIn PDF document text
    • https://voderixata.weebly.com/uploads/1/3/4/2/134266977/2981749.pdfIn PDF document text
    • https://zoxaxutonixada.weebly.com/uploads/1/3/5/9/135957052/sefunuvede_rulebalinube_mupiki_bixusumebo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144447612/do_you_have_to_pay_for_activinspire.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/w/file/fetch/144434217/28860675724.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/working_principle_of_submersible_pump.pdfIn PDF document text
    • http://nikekuva.pbworks.com/w/file/fetch/144414339/descargar_five_nights_in_anime_2_para_android_apk.pdfIn PDF document text
    • http://noxixap.pbworks.com/w/file/fetch/144426321/ruxujabudasupukedewiked.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144424203/inshot_photo_editor_pro_mod_apk_download.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144434214/good_night_kiss_gif_images_download.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/moluj.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/w/file/fetch/144442950/gadesuwaxinaw.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144442593/wizeluxerija.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/sda_bible_commentary_vol_4.pdfIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/144427839/how_to_prepare_for_interview_job.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144426582/chapter_1_their_eyes_were_watching_god_quotes.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/f/party_systems_icivics_answer_key.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/sowakojovikazubamam.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144428745/simoboxigudufiwadok.pdfIn PDF document text
    • http://gufabewa.pbworks.com/f/how_long_does_myofascial_pain_last.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144421125/can_we_convert_2d_to_3d_in_autocad.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/f/can_i_use_vicks_humidifier_with_newborn.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_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 5488 bytes
SHA-256: 51239e4839907fff97db42876bfba5224671cecfbbca05042d804d6c71d60556
font_01_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 9892 bytes
SHA-256: 6385f4059eaab181869f8fe4921d93ab8944e789577eeeebb4236146e71f19c6