Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e032589de1be64…

MALICIOUS

PDF

118.4 KB Created: 2021-03-17 17:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8d00501f2a5898278d5dbbc28edfc93 SHA-1: 5f5dee8774be94ecae9aa77648edae5679febf87 SHA-256: f2e032589de1be64fbaa258b92ce3b9f16762a41c2f4606e7d98b5b15985ac49
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of generated links. The primary external URL, 'https://botokaw.ru/award?keyword=ambulance+care+practice+pdf', appears to be a lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=ambulance+care+practice+pdf
    • http://dayzcommunity.info/pharmacology_made_insanely_easy_free_downloadkaa1e.pdf
    • http://swast-group.website/jimu_unicorn_robot_instructionsozvf6.pdf
    • http://balifruit.com/wekunefpssms.pdf
    • http://bridgecommerce.com/70417993210kdobg.pdf
    • http://www19216801.site/butekozirejafivezam1s7m.pdf
    • https://bemitobiz.weebly.com/uploads/1/3/4/6/134681698/4729772.pdf
    • https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/7976722.pdf
    • https://wisukasef.weebly.com/uploads/1/3/1/4/131453855/7033080.pdf
    • https://cdn.sqhk.co/fivodewile/jcyggid/bukarawodemiwumabe.pdf
    • https://cdn.sqhk.co/metumolalub/hAjeLgh/pepper_appetizers_cream_cheese.pdf
    • http://umdtheatre.ru/lateral_move_irrigation_price4d6r8.pdf
    • http://tehnopolis.org/what_is_a_complete_subject_and_predicatedtsn3.pdf
    • https://cdn.sqhk.co/jirowolad/ehfyijf/gizujuju.pdf
    • https://modefijibig.weebly.com/uploads/1/3/6/0/136011483/pusujifuxipipenupa.pdf
    • https://cdn.sqhk.co/somepizeko/cEzBrgj/developing_effective_assessment_in_higher_education.pdf
    • https://cdn.sqhk.co/sativomofij/dhhhecf/86091180804.pdf
    • http://pochta-24.cc/what_kind_of_ammo_does_ruger_lcp_usegvxv5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulikowexunepov/msi_970a-g46_troubleshooting.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_6d848d9e40a647eabcef5de4d44d7de2.pdf?index=true
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_3516ff2951794c0cbfa05ffaf84dd39e.pdf?index=true
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_1518be171bd74f1f89dc88118b241ef2.pdf?index=true
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_b43ce8f736264adfbb8dc8a7ab53e30f.pdf?index=true
    • https://s3.amazonaws.com/mesixadelomomo/pediatric_heart_failure_guidelines.pdf
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_81120c64d6b645d4a6f82344a27fe9a5.pdf?index=true
    • https://s3.amazonaws.com/ropuba/contoh_report_text_bahasa_inggris_beserta_artinya.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019313.bin
240104971757d9a222647591181e30637dad4bf25b31ea8809d84df57ac8375a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19313 5252 bytes
font_01_sfnt_off0001a4d1.bin
62a76c66355b8a0a77dc9b5815c5b366b243d5d6d67564fda5dfbebfd0a02867		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4D1 10936 bytes

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