Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3977c3b1e25677b…

MALICIOUS

PDF

76.6 KB Created: 2021-02-18 07:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 68f102e264e2305f3685f791e15c65f9 SHA-1: d3bb70c59ae6430ee9d1cf9f4ca87eefffe8b546 SHA-256: d3977c3b1e25677b7e6a2aa31d2070d878bf911720f836d4b471219040f8d128
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one specifically pointing to a URL that appears to be a lure for HP LaserJet setup. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable hosting, combined with UTM parameters, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=hp+laserjet+4200+network+setup PDF link annotation
    • http://creditscorecard.info/afterlight_app_free_for_pczo2es.pdfIn PDF document text
    • http://confirmationhelpcenter.com/zutogvg8pf.pdfIn PDF document text
    • http://tublitalia.space/why_does_cat_tail_twitch4tps9.pdfIn PDF document text
    • http://bioforcecolumbia.site/xbox_360_controller_wired_for_windows_1068nz5.pdfIn PDF document text
    • http://mastericy-chistoty.ru/boom_da_bash_barracuda_albumfe2e9.pdfIn PDF document text
    • https://cdn.sqhk.co/pifitudebuxo/jgJcjfb/7443299582.pdfIn PDF document text
    • http://lavkavkusa.store/project_management_professional_certification_prep_course2ak6v.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/jjcheih/mine_rescue_level_17-_2.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/s6OaBgg/nijufeso.pdfIn PDF document text
    • http://heliusdesign.ru/google_earnings_report_q2_2018y9cjy.pdfIn PDF document text
    • http://milesnires.xyz/sheetrock_anchors_home_depotpf7ny.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://desiwafinu.epizy.com/abaddon_ii_regular_font.pdfIn PDF document text
    • http://fakadigat.epizy.com/application_form_for_employment_at_woolworths.pdfIn PDF document text
    • http://degedudu.rf.gd/formal_letter_writing_topics_for_grade_7.pdfIn PDF document text
    • http://wigezenefibi.epizy.com/best_android_phones_under_20000_gsmarena.pdfIn PDF document text
    • http://gitinilu.epizy.com/darkness_rises_assassin_pvp_skill_guide.pdfIn PDF document text
    • http://lavaraf.epizy.com/vowefefolotufafixigale.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/anticipatory_bail_format_in_india.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_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 5368 bytes
SHA-256: d0131caea8fd62d04c6519b6624c1d3dc707a8659c445f9d8c55bee4b8f6549f
font_01_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 10836 bytes
SHA-256: bb06e840e07076baa8ef967f0a7a71e911e30784dbaf01e2f2d99cb729b82e28

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