Malicious PDF — malware analysis report

Static analysis result for SHA-256 981c88d21e000a4a…

MALICIOUS

PDF

102.4 KB Created: 2021-03-24 12:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cf3302a856f7dea6f896cbaa72eec97 SHA-1: a40f22fef89bb4ad6134a23f119921131d00ff36 SHA-256: 981c88d21e000a4a6606a124c5325a2e804be7d6c73b16be8d831a161eef0713
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://resalured.ru/123?utm_term=sentence+transformation%2528+rewrite+questions%2529
    • http://vedefufedogoke.iblogger.org/fapaxurajab.pdf
    • http://de-bewertung-889562.icu/fejopololubenuzateri75peg.pdf
    • http://lady-bug.club/fundamentos_de_enfermeria_susana_rosales_y_eva_reyes_gratis1xsa0.pdf
    • http://monubagujizud.mywebcommunity.org/tanurigugosi.pdf
    • http://daating19.site/2611532989246jy2.pdf
    • http://xexisutufas.iblogger.org/ghosts_of_saltmarsh_dm_guide.pdf
    • http://worldworkbook.com/pejovetivileb4eg8k.pdf
    • https://static.s123-cdn-static.com/uploads/4455403/normal_600576e871c9e.pdf
    • https://cdn-cms.f-static.net/uploads/4463825/normal_6056aecea0fd2.pdf
    • http://jolovomolosubi.getenjoyment.net/dr_amen_ra_protocol.pdf
    • https://static.s123-cdn-static.com/uploads/4473410/normal_5ffef856eea8d.pdf
    • https://cdn-cms.f-static.net/uploads/4461211/normal_605542669d703.pdf
    • https://static.s123-cdn-static.com/uploads/4485813/normal_5fee474360fba.pdf
    • https://cdn-cms.f-static.net/uploads/4464877/normal_5fd1d82d913ea.pdf
    • http://dajexori.mypressonline.com/7_key_principles_of_effective_communication.pdf
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5fd2d9b7f1318.pdf
    • https://static.s123-cdn-static.com/uploads/4480893/normal_5ff84ca3194b1.pdf
    • http://sidanixom.22web.org/project_milestones_and_deliverables_template.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_88c005090e634407a01d7016c04eab14.pdf?index=true
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_8ec8058e588d43258a971a460f9d901b.pdf?index=true
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_f8636798048b444da9b187fddfc89654.pdf?index=true
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_2811293a42b0492eaf3a10bc65b280ba.pdf?index=true
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_1aacc21796fe4139bf8e41ed62606b02.pdf?index=true
    • http://bonizeza.epizy.com/bahubali_2_telugu_movie_700mb.pdf
    • http://bolarerovu.epizy.com/60097843851.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001526a.bin
75bfb6950cead5a4ae448fcb2e27aaaa018444851f6a727f04a993809988adc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1526A 5472 bytes
font_01_sfnt_off0001651a.bin
098bc34b0232375f3cab0c456adb28dd6cb4824b2786f788b0f59dbd2802ce55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1651A 11200 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.