Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc7ea5f9a1420a7…

MALICIOUS

PDF

76.2 KB Created: 2021-03-14 23:37:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 44586e094c97962af37634e354bf182a SHA-1: 406292dd2a9f063343f853671f490e68e97bdb73 SHA-256: 8dc7ea5f9a1420a779cd00c4ba1a283edaf1cf7e1c43d99f98dba65b424e0743
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common social engineering tactic. The presence of numerous external URIs, including one pointing to 'nipisod.ru', suggests the document is designed to redirect the user to malicious content or download further payloads. No scripts were extracted, but the PDF structure and heuristics point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/strik?utm_term=how+to+set+time+on+clock PDF link annotation
    • https://cdn.sqhk.co/kafodarifab/gfVcKt2/brownes_greek_yoghurt_nutritional_information.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383561/normal_5fd09344e4761.pdfIn PDF document text
    • https://cdn.sqhk.co/felodunom/jh25Hha/shape_slicer_3d_level_130.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/i1DjgjS/employee_emergency_contact_form_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/mbhhahc/christmas_running_shoes_nike_zoom.pdfIn PDF document text
    • http://wuwadipuzemorib.22web.org/what_is_3_characters_long.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/dSgjhhf/digital_marketing_job_apply.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_602991da9b8a7.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/hcbaP7J/39120915741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_5fd96f41dc1ee.pdfIn PDF document text
    • https://cdn.sqhk.co/pewovixosafu/gKhieh2/craigslist_atlanta_jobs_wanted.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_60313bac22903.pdfIn PDF document text
    • https://cdn.sqhk.co/salefudodid/sXjdigA/nikah_mubarak_messages.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vapedefomagejev.epizy.com/fekiroxeborojusamatuv.pdfIn PDF document text
    • http://tomuvonunilo.epizy.com/troubleshoot_insinkerator_hot_water_dispenser.pdfIn PDF document text
    • http://vubixijugisoloz.epizy.com/defirofaxi.pdfIn PDF document text
    • http://bimumebuzof.epizy.com/84555832553.pdfIn PDF document text
    • http://zatafefot.rf.gd/36500646114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce2cc8fc-b984-4c43-8fa9-a0312f572239/61260987949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd0bb1b-9d54-453f-976b-f3acc9b239b9/how_do_you_calculate_your_life_path_number.pdfIn PDF document text
    • http://wofukisunoxo.epizy.com/nahuatl_pronunciation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d979e9ed-a73f-4f7f-97f1-883fbc31bfd4/how_much_is_ps4_on_black_friday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ea9e05-8105-4699-9bac-22560b91a70e/85199197527.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 4756 bytes
SHA-256: b97c370a83c8731acc1cee58bd7406e3bedfad758b3a02a487e8a1b974a10f8b
font_01_sfnt_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 10596 bytes
SHA-256: d540c7f2535d8efcf4b881c4e9cfb1307350ad2d399f7fce1185b92a710b3a82