Malicious PDF — malware analysis report

Static analysis result for SHA-256 521865834f849af2…

MALICIOUS

PDF

75.3 KB Created: 2021-03-03 21:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d2530b3b6dde7a59711a4924c386bb0e SHA-1: 7989fc84c62fb135a6572479f9cad67b3a1bad83 SHA-256: 521865834f849af21f17e0c92b7f4ee4e81547f50f6103a066f5d0293f796137
126 Risk Score

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 designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver second-stage payloads.

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://dugedepap.ru/strik?utm_term=nasb+thinline+bible+large+print+genuine+leather+buffalo+blue+red+letter+1995+text+comfort+print PDF link annotation
    • http://tekplafond.xyz/paint_sprayer_rental_medfordb82wm.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/pabenepumurelotapifepewow.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/nikon_coolpix_p510_charging_time.pdfIn PDF document text
    • http://lastmarkt.ru/anglican_igbo_hymn7hzx5.pdfIn PDF document text
    • http://fapseo.ru/25889429746ivgkl.pdfIn PDF document text
    • http://maturibcgj.space/flipgrid_tutorial_for_teachers8a3bd.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/7329584623.pdfIn PDF document text
    • https://vujaroroxino.weebly.com/uploads/1/3/5/3/135314625/166a8cab.pdfIn PDF document text
    • http://laxana.ru/kotak_securities_account_closure_formgseqy.pdfIn PDF document text
    • http://swiss-gear.store/handover_checklist_word_templateyczhz.pdfIn PDF document text
    • http://ilkertr.shop/xoditadevoreruruxin4xql.pdfIn PDF document text
    • http://dmgameplan.com/internet_speed_test_freexz2gh.pdfIn PDF document text
    • http://instahelpforbusiness.com/is_obamacare_bad_or_goode4vjj.pdfIn PDF document text
    • http://blekrossi.ru/2694535374395d4d.pdfIn PDF document text
    • http://copyright-supporthelp.com/how_do_i_reset_my_truma_water_heateraeqmp.pdfIn PDF document text
    • http://optamorem.com/mitupediwogonabefatocp111.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/kawotexulozax/ubuntu_12._04_iso_for_virtualbox.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/fitbit_charge_3_band_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/future_simple_exercises_worksheets.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/selututigej.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_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 6080 bytes
SHA-256: 5e708d2de2c59f29dedf707c1575dac4ae9778d87bac450c84d07d9df1994bd4
font_01_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 11056 bytes
SHA-256: 1fa5c2258d7cea8497316012a3135fd59b26b142ff0528b79f2fe357af2ed3a4

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