Malicious PDF — malware analysis report

Static analysis result for SHA-256 426075ffea86de47…

MALICIOUS

PDF

96.6 KB Created: 2021-05-19 07:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fd9b79971c406cf8735777e5152fec9e SHA-1: b2f5a4ee222d1527b9612f1c22d9839889d0dcf6 SHA-256: 426075ffea86de471c592f593de1d98f55597966155da7705ec106e3f8bf19a6
126 Risk Score

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://baarspo.ru/strik?utm_term=50+shades+of+grey+epub+free+download+for+mobile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451750/normal_602edee62674d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_6008a7a72a872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_6018f63b4235f.pdfIn PDF document text
    • http://ledoxune.22web.org/zekadizipog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_60264b677c5e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebilusetiguw.rf.gd/gijetifejes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a490592-ad6f-4730-b3ff-635d83326119/7_years_lyrics_karaoke_piano.pdfIn PDF document text
    • http://tajemom.epizy.com/redspot_a_level_physics_download.pdfIn PDF document text
    • http://nujobig.rf.gd/bitematetupoduwuk.pdfIn PDF document text
    • http://mifazafodig.rf.gd/99556976443.pdfIn PDF document text
    • http://nolonogatifotop.epizy.com/wuzis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14c75af-41e9-4666-9332-19e205109211/72467497762.pdfIn PDF document text
    • http://fekuzigide.epizy.com/disney_piano_sheet_music_free.pdfIn PDF document text
    • http://rifarowamenu.rf.gd/rheem_tankless_water_heater_service.pdfIn PDF document text
    • http://daxararudivoxik.rf.gd/equidad_educativa_en_mexico.pdfIn PDF document text
    • http://ruzojonawa.epizy.com/bixolazezadajetivida.pdfIn PDF document text
    • http://tujatubaniza.epizy.com/74989435586.pdfIn PDF document text
    • http://gazezubutajon.rf.gd/yamaha_rx-v661_remote_app.pdfIn PDF document text
    • http://jofesosozofoso.epizy.com/aaru_movie_songs_now.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_off00013678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13678 5960 bytes
SHA-256: 2f6830776ca0e0a73501afb6e9a2d4992c498848a63723abab5635c4ba89b723
font_01_sfnt_off00014aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAF 12444 bytes
SHA-256: bf5f3317cc719bc55ea74e9919b0481f12e8dad1424f6b7124d83f17a688815e