Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc2ab99a3dbd5f2…

MALICIOUS

PDF

82.6 KB Created: 2021-03-13 20:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14428fe92f3a8d42a70534d0d8af5d10 SHA-1: 8efa4960559aabcfc7c4689993bbe2bedb287e9a SHA-256: 5fc2ab99a3dbd5f20a4e97945cfc5f5672857f16de7d8887f4500836960bab5e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDFs. One of the primary external links, 'https://jacksth.ru/strik?utm_term=how+to+turn+off+cateye+mity+8', suggests a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=how+to+turn+off+cateye+mity+8
    • https://gawopina.weebly.com/uploads/1/3/2/8/132814119/b051eb73a2c231.pdf
    • https://cdn.sqhk.co/rosisole/qjcaqjc/sonic_skin_pack_minecraft_pe.pdf
    • http://moneymaya.site/r_o_ka_full_form_kya_haib7zko.pdf
    • http://repair-foto.ru/bollywood_movies_mp4_newpdwqj.pdf
    • https://cdn.sqhk.co/malakizojaji/xhhQcgf/juvazuj.pdf
    • https://cdn.sqhk.co/vunofufi/gdjcSTr/gisetawapekapatajoxexup.pdf
    • https://cdn.sqhk.co/motulobugaji/oihMhd2/foot_locker_new_york_city.pdf
    • http://instup.xyz/math_teacher_cover_letterin3um.pdf
    • https://waniritapi.weebly.com/uploads/1/3/0/7/130739375/7920169.pdf
    • https://cdn.sqhk.co/gisatajofo/kZPL9L5/printable_blank_month_calendar_template.pdf
    • http://strapslap.online/alimentos_ricos_en_hierro_fisterraug4xr.pdf
    • http://sberpodarok2020.online/matrimonio_de_evaluna_y_camilo_echeverryp3vwx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d8e91d09-a7b5-46d9-b910-e58f32a63854/what_is_the_best_restaurant_to_eat_at_on_weight_watchers.pdf
    • https://uploads.strikinglycdn.com/files/dbb91e6a-4224-4203-b384-7631b2139df3/sugumuragulazotosoxugi.pdf
    • https://s3.amazonaws.com/radubozufiwo/wuzasavazigojavap.pdf
    • https://uploads.strikinglycdn.com/files/6b5d35f7-3919-46cb-bccc-f4a1890a7f09/what_is_the_role_of_a_trustee_in_a_church.pdf
    • https://s3.amazonaws.com/xufoxorog/what_does_it_mean_to_fetch_firewood_in_the_dream.pdf
    • https://uploads.strikinglycdn.com/files/3087a55b-03d9-4e54-8d47-8b5f5b0b9448/rifexakudegizuzakemog.pdf
    • https://s3.amazonaws.com/nemafu/development_lifecycle_and_deployment_designer_resource_guide.pdf
    • https://uploads.strikinglycdn.com/files/651f3699-4a3e-4a71-978e-c5a35fcf973e/landwirtschafts_simulator_2015_ps3_cheats_mehr_geld.pdf
    • https://uploads.strikinglycdn.com/files/35a6ebe7-4afb-450d-83f7-d59a6cc7edc5/plantronics_cs510_headset_troubleshooting.pdf
    • https://s3.amazonaws.com/lekezaru/long_way_down_floor_4_summary.pdf
    • https://uploads.strikinglycdn.com/files/ce7b83eb-d48f-4077-8f23-1630da003cd4/how_to_reset_check_engine_light_nissan_sentra.pdf
    • https://s3.amazonaws.com/dinigugaxej/wiseguy_book.pdf
    • https://uploads.strikinglycdn.com/files/053a8801-3206-4069-bd74-313ee168d7d5/cognitive_behavioral_therapy_for_dummies_workbook.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_off0001052c.bin
e17b98985dd0db87e33102b89fc368be302bd0d2e56ff83db1388b5ee837e542		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 5168 bytes
font_01_sfnt_off000116c1.bin
0788d1a02d923644a02a50d400fd87894e306c2773a4961c15f275d8578e38dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C1 11120 bytes

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