Malicious PDF — malware analysis report

Static analysis result for SHA-256 d448b040f6a3eb49…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 22:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eeccfc9aa9a98a4a328e4e25c762da4f SHA-1: 9fcc6afc51e693c4ffb609f4c0cc855b60b9e27b SHA-256: d448b040f6a3eb49f04010fe3a2fbe7888965898d8418109ad4db816c8ac96d0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/123?utm_term=bikini+body+guide PDF link annotation
    • https://cdn.sqhk.co/batumozi/Yyicihg/autonics_panel_meter.pdfIn PDF document text
    • https://cdn.sqhk.co/javabufe/hbgjMig/lovudun.pdfIn PDF document text
    • http://sulalaketukabox.22web.org/xitegimak.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/hiYijgd/42938534606.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/igU0FiG/strawberry_shortcake_sweet_shop.pdfIn PDF document text
    • https://cdn.sqhk.co/votawusebak/f8igTgh/classic_slots_of_vegas_free_slot_games.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/RhbPJJt/khan_academy_eureka_math_5th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/gYOEgj3/android_screenshot_shortcut.pdfIn PDF document text
    • http://saxefitipar.iblogger.org/template_powerpoint_free_blood.pdfIn PDF document text
    • http://terasivox.22web.org/daily_employee_attendance_sheet_in_excel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nedomovoguluz.rf.gd/aditya_birla_mutual_fund_sip_form.pdfIn PDF document text
    • http://tomunipi.rf.gd/pofebaxotanitifivikuwizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f5fb11-6de8-459a-a813-b19fc3eff2a7/river_flows_in_you_electric_guitar_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad419f73-8211-4e52-b06f-0e0441fc5aec/lg_top_load_washing_machine_leaking_from_bottom_front.pdfIn PDF document text
    • http://lipitesagodat.epizy.com/franz_kafka_the_trial_film.pdfIn PDF document text
    • http://tisudaxutuz.epizy.com/oscar_wao_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dacb9746-4a92-402b-9fdc-fc95432f1c1c/what_does_the_arrow_itself_mean_in_a_chemical_equation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36984ba-0361-4cf9-87e1-106f4cf5e90a/how_to_adjust_resistance_on_schwinn_ic4.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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 4832 bytes
SHA-256: 2026c27fe2706a2302cda2b473e71c46707dd65259a2d192130ee4e13338f30c
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 11688 bytes
SHA-256: 05f757e4f53b757b360060a70ff494d7036b452aa4aa6ed23e0235dc29f9243d

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