Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5b0a85004547a4…

MALICIOUS

PDF

80.1 KB Created: 2021-03-13 19:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3bef8e98f590bfb17abcabf0708ac83c SHA-1: 9b0726bf833c6b3f3eb018fe25116c498dd6ddfb SHA-256: 4f5b0a85004547a4515f4922615477fa83a4201b8cd851f6c82b980fd1e8b1b0
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=filosofia+aristot%25C3%25A9lica+pdf PDF link annotation
    • http://dorightpress.com/helios_airways_flight_522_reportxrie9.pdfIn PDF document text
    • http://insurancecarusa.com/french_irregular_verb_worksheets4ehmu.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/the_blades_of_grass_poem2uvtf.pdfIn PDF document text
    • http://connexion-amelii.xyz/bafamevg3x.pdfIn PDF document text
    • http://becloud.website/394862198498v9od.pdfIn PDF document text
    • http://mexicotop3.xyz/pdp_energizer_xbox_one_controller_charger8a8ik.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/lidojogepe_deronivoli_xevudixunop_pevebiduj.pdfIn PDF document text
    • https://bixunirejo.weebly.com/uploads/1/3/5/3/135329058/f13ee.pdfIn PDF document text
    • http://my-credit.info/manufacturing_planning_and_control_for_supply_chain_management_6th_edition_downloadov9ht.pdfIn PDF document text
    • http://regvoolkim.website/35608847007leo2s.pdfIn PDF document text
    • http://mebelintera.ru/69479152712m19n5.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/wexukufedepim/business_management_for_dummies_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/beginner_bible_study_guide_gracelink.pdfIn PDF document text
    • http://josegofubusem.epizy.com/runuzese.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/free_microsoft_excel_dashboard_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/3739974661.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/progressive_era_study_guide_alcos_2.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/fios_router_g1100_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/free_medical_office_assistant_resume_templates.pdfIn PDF document text
    • http://zabifesekoxida.rf.gd/what_does_it_mean_when_someone_says_remember_your_roots.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/the_wave_radio_station_delaware.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/sibigavetigulofam.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 5244 bytes
SHA-256: 06e5b162a70111cc66ac2ac61bc17ec4081c49e1feaac769f9dc9215f1263fb3
font_01_sfnt_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 13540 bytes
SHA-256: 1349c932c328fc65ceb189121c8e02fa7cbf1454d8a436b98596e27d35a81c2f

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