Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c74f72320ac40b…

MALICIOUS

PDF

80.2 KB Created: 2021-03-22 18:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17e039acf08ae087d86c0ff94e32dec8 SHA-1: 2693eb7197bd454b99aefad79f9dfc8c77f45f2c SHA-256: 17c74f72320ac40baded0fc2e470248a1828757a9c8dbe16251372deaa9ba86f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used in link farms to artificially boost search engine rankings or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=teachers+day+images++hd
    • https://cdn.sqhk.co/busoleva/icujbcJ/world_warship_combat_mod_apk_1._0_13.pdf
    • http://vetebozo.mypressonline.com/7575478254.pdf
    • https://cdn.sqhk.co/lifupowaseli/idEhgVA/73953613291.pdf
    • http://linufiwanekume.scienceontheweb.net/buranevozazoxeletu.pdf
    • https://cdn.sqhk.co/dijowasedop/gjDDPiT/photo_editor_free_download_windows_7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8c79b88c-061f-4d69-a6b2-8282b3b8addf/search_bar_google_chrome_not_working.pdf
    • https://s3.amazonaws.com/badodemebo/newavikadupawufuzadatoze.pdf
    • http://tofilijewok.atwebpages.com/11756451680.pdf
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_2762f99034a642338afecafced188271.pdf?index=true
    • https://s3.amazonaws.com/xopugup/takujowa.pdf
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_3eba1503ea6a4909aec940ee2d5bfbf1.pdf?index=true
    • https://s3.amazonaws.com/fajujiju/whirlpool_wtw4815ew1_lid_switch.pdf
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_1d5cd9ba8fa443179e371bcf37317470.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e34531e1-1ea5-4ed0-90dc-963ed6d72ef7/waful.pdf
    • http://manosotidokef.myartsonline.com/luzuba.pdf
    • https://s3.amazonaws.com/gapivegek/24798215533.pdf
    • https://s3.amazonaws.com/setigafat/lepesenogadimika.pdf
    • https://s3.amazonaws.com/viromibukoleliw/dd_campaign_planner_notebook.pdf
    • https://uploads.strikinglycdn.com/files/86595624-3802-468c-b85c-f67fe9793326/cyberpunk_2077_ps4_patch_update.pdf
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_c6b3ec76ef844f849b24dfb75a51cc2f.pdf?index=true
    • https://s3.amazonaws.com/puretulenuza/characteristics_of_aquatic_ecosystem.pdf
    • https://s3.amazonaws.com/gedimuta/safivefokiwunigijiw.pdf
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_5fb60dccd4a94856b991d00cdfe240ed.pdf?index=true
    • https://s3.amazonaws.com/pevuwarobuvowa/garisunuvugutogasem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed16.bin
a8494ed20b61aeac8fe2b0b657e2bd45cdbfd2b9cebe579a6486d492f7c0dee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 5372 bytes
font_01_sfnt_off0000ff2a.bin
73983ccd477f0e4c07634362c0f9f13a23cea415a26bff37f7f125d59a681190		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 1936 bytes
font_02_sfnt_off0001086d.bin
1d867bb5292f7475de119af5fc6094eb057e7c7a3625855246d887a59dab48b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 12176 bytes

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