Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a9d9842ece53e3…

MALICIOUS

PDF

80.4 KB Created: 2021-03-05 12:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a168d7665e437a5c8f7c616815e90a2f SHA-1: 5d28e4240fa6147659da1a8bd9681ac86aee2586 SHA-256: 23a9d9842ece53e320ad3f9bfd77fbce4b5e6f7f74eef54e908330e4a3cd639e
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, including one that redirects to a suspicious domain, likely intended to trick the user into clicking a link. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests a link farm designed for SEO manipulation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=hillsborough+county+public+schools+fall+2020 PDF link annotation
    • http://fafesixokegigi.getenjoyment.net/reading_level_comparison_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/ig6oEr3/terminal_emulator_for_android_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/hcHhgcW/66759621259.pdfIn PDF document text
    • https://cdn.sqhk.co/bedipidis/igd64e0/givogadelopu.pdfIn PDF document text
    • http://menajaf.iblogger.org/cover_design_for_books_template.pdfIn PDF document text
    • http://lenugaguv.medianewsonline.com/ernest_hemingway_cat_in_the_rain_trke.pdfIn PDF document text
    • http://janusek.22web.org/best_advanced_excel_course_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/g1geVhG/didi_delivery_promo_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b02f33ff-773f-4445-ba63-ebc6c68af913/kikuwujit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266d6145-c21f-4180-9900-70fdf6448b59/fifuvutonigir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9686174b-dacc-4a28-bb4e-e27bd1c50989/dotupulegomajuleritanulok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ab05cd-b894-4493-8594-e0e27bc049cb/86445697912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad08488-f91e-4f95-aa98-c01f90a18460/pretty_little_liars_season_7_episode_8_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3f43f5-3702-4872-99f7-b63fde3fa7c7/13942617383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66dec25b-0277-4edd-b8b2-e8badeec1473/samsung_smart_remote_bn59_not_working.pdfIn PDF document text
    • http://rotitow.rf.gd/90783601.pdfIn PDF document text
    • http://sajatuvireguta.atwebpages.com/power_electronics_a_first_course_solution.pdfIn PDF document text
    • http://muxuzuvom.epizy.com/jasabad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98e932d-adf0-413f-8af5-0dce49084b33/resaromeloka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48b2e86-086f-44c9-95ee-8864219a031a/how_to_start_a_new_track_in_audacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce0c11b-72c2-4247-acff-11c59964bc44/najavir.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/sijezukivepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc9a617-6d2e-43e6-a15f-5f7ad03da5f0/how_to_become_a_vet_care_assistant_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a19bc8e-50d6-47fb-b4ca-7b3495151d1b/asrock_z87_pro3_drivers.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_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 5752 bytes
SHA-256: 485e268138b9d5c5ff0e09d70b404112bf891b4a0b77fc0cb0fc196eaeb1335e
font_01_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 10772 bytes
SHA-256: f72bab9b4b75a8dfa029e436eb2e54587943e30263e75ccb24da12368983d610