Malicious PDF — malware analysis report

Static analysis result for SHA-256 df241e19a5a503c4…

MALICIOUS

PDF

77.1 KB Created: 2021-03-16 02:31:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9cde8d29bd2ad510ec5b33ebed5a1959 SHA-1: be7916174893060e6cef916da5e7c946afdc7035 SHA-256: df241e19a5a503c48025d992c7f9421137d9fb9ce144458f7e14e1666d378480
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to potentially malicious redirectors or disposable hosting. The primary URL identified, 'https://dafemum.ru/strik?utm_term=why+will+my+washer+not+spin+or+drain', is flagged as a malicious redirector. The document's structure and the nature of the links suggest it is part of a link farm designed to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=why+will+my+washer+not+spin+or+drain In PDF document text
    • https://cdn.sqhk.co/jatobeguji/cuhgghe/best_3_point_shooter_celtics.pdfIn PDF document text
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/4172940.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/1663108c34803b.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/cggHqUk/61874744286.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/jajc9ij/nobunizuf.pdfIn PDF document text
    • https://cdn.sqhk.co/xororasomig/jhjiibt/lucky_cash_hack_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wukomidekepu/jdhghe7/easy_voice_recorder_pro_apk_2._7._1.pdfIn PDF document text
    • https://cdn.sqhk.co/vebudirepo/Uhdgggh/how_to_draw_superheroes_easy_step_by_step.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/fokaxatel.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/be9d00d0-e870-4187-80e4-1c71662b898f/borezosu.pdfIn PDF document text
    • http://bubaxomunuf.rf.gd/81182171412.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_bee149021e0646a2949916995cb0b8b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b415d2a-6f64-4642-b213-ae71e573532d/what_is_bs_management_course.pdfIn PDF document text
    • http://duzunop.rf.gd/ripibetonabatarusoxotov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3da9a6-398e-47f1-bdc0-f84f7531fa35/casio_fx_cg20_emulator.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_71f3c6b877314948ab019a926f5cc2dc.pdf?index=trueIn PDF document text
    • http://gorevifero.epizy.com/annual_percentage_yield_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae8d8314-f890-4d68-9d2d-2945dea3a769/ford_mustang_ecoboost_fuel_consumption.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_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 5408 bytes
SHA-256: 097d5e2572ba90f79eb4e272537bd7aa36840135691ac23c7240ecdd9143364a
font_01_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 11740 bytes
SHA-256: 248faee63140c4ad8fce76bab17e22c34d67add9377d80cadde717d911037658