Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e90c64c860b7607…

MALICIOUS

PDF

72.0 KB Created: 2021-05-06 03:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e10843eab9db8695e03fd45e5740c408 SHA-1: 4d790550f363a65cc6d21615ed52d8412cfdc092 SHA-256: 5e90c64c860b7607acff6c3dbd709509faee3ddc6db450b5f811dc4a74ab91fc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous external URLs points towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=how+to+remove+ford+quick+connect+heater+hose
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/8525414.pdf
    • https://lukidamovepuk.weebly.com/uploads/1/3/1/4/131437538/duzesepetupeferop.pdf
    • https://datakazikuvosu.weebly.com/uploads/1/3/4/3/134353567/kivaxilov-jamubetipovev.pdf
    • https://cdn.sqhk.co/kitujesijak/qjjihhd/introduction_to_business_management_8th_edition_download.pdf
    • https://cdn.sqhk.co/rujopupomob/gytfggY/counter_terrorist_mission_fire_shoot_mod.pdf
    • https://joguxakiwemov.weebly.com/uploads/1/3/4/7/134707067/31747a97339ad5.pdf
    • https://cdn.sqhk.co/vudararemane/ib3RhhM/32828645012.pdf
    • https://vonojatu.weebly.com/uploads/1/3/4/7/134711894/82069f9ad7.pdf
    • https://cdn.sqhk.co/dibirolinu/brjdqhg/pixel_gun_3d_mod_apk_2019_ios.pdf
    • https://cdn.sqhk.co/giganopof/hjjfThj/biomedical_equipment_technician_bmet.pdf
    • http://all-system7.work/otherworldly_patron_feature_level_6typtg.pdf
    • https://cdn.sqhk.co/zoburawava/gGdjeYS/xekudugedujafidug.pdf
    • https://mivewuwadomabat.weebly.com/uploads/1/3/1/6/131606259/81668c2c487a927.pdf
    • http://winwites.space/how_to_service_a_onan_5500_generatorbpjsj.pdf
    • https://cdn.sqhk.co/kutajanode/I3Vggge/snakehead_fish_for_sale_australia.pdf
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/9531776.pdf
    • https://dorugemapakew.weebly.com/uploads/1/3/4/6/134680888/laniver.pdf
    • https://cdn.sqhk.co/dubibuwa/jje53gf/turbo_ls_running_hot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/145bb59e-9ad5-4e4a-a2b9-aff397950c0c/what_is_the_role_of_a_prophet_in_the_bible.pdf
    • https://uploads.strikinglycdn.com/files/555cc7b4-0bba-47ca-91ad-38f88d0c8bf1/antemortem_vs_postmortem_clot.pdf
    • https://uploads.strikinglycdn.com/files/8509dfe3-4b98-41d8-ac56-79292d74ce79/64039699826.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_off0000da70.bin
88e45368e728876fd4aaadc483e5af5a58c581aefc76217db9cd01537fb63f7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 5532 bytes
font_01_sfnt_off0000ed28.bin
358fda5b26afd590755277a53d8cd632844cbf912a835b98f175260149ea5edb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 10808 bytes

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