Malicious PDF — malware analysis report

Static analysis result for SHA-256 8132402d246b4be2…

MALICIOUS

PDF

73.3 KB Created: 2021-06-04 02:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6d62904029c83e074c6603d4e14f12b6 SHA-1: 0c3affbcdc369fa341961cfa1d76caf131bad49e SHA-256: 8132402d246b4be26a5c54ab53753bcf4d28d95b218f8141563fa58fb76c54bc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into downloading further malicious documents.

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
  • 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.
  • 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://coretry.ru/pbw?utm_term=sat+prep+black+book+2018+pdf+free+download PDF link annotation
    • https://rogebupapopax.weebly.com/uploads/1/3/0/7/130739826/7899296.pdfIn PDF document text
    • https://veretiwuwe.weebly.com/uploads/1/3/1/4/131406621/8050930.pdfIn PDF document text
    • https://xezixopizanew.weebly.com/uploads/1/3/5/3/135314636/9948830.pdfIn PDF document text
    • https://xizikako.weebly.com/uploads/1/3/0/9/130969027/tozakoxanodasoz_vuwugudame_bodex_duralimaxe.pdfIn PDF document text
    • https://misekijenag.weebly.com/uploads/1/3/1/3/131380320/lugekowobezuluzav.pdfIn PDF document text
    • https://kewesolatuveg.weebly.com/uploads/1/3/1/4/131452958/c9d233292.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/newarikexodilopajeb.pdfIn PDF document text
    • https://koduvorubosu.weebly.com/uploads/1/3/4/7/134719400/vuzijape.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jedilukiwo.pbworks.com/f/which_samsung_smart_tvs_have_voice_control.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144417159/pekaxofamesejamositunuze.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/sogujejivuxixupivajivaze.pdfIn PDF document text
    • http://rukutuxeriro.pbworks.com/f/fisica_general_hector_perez_montiel_4ta_edicion.pdfIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144439263/kimyasal_trler_aras_etkileimler_soru.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144548775/zizajojokorefoxukabob.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/w/file/fetch/144580545/2125774001.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144544008/full_namaz_in_hindi_download.pdfIn PDF document text
    • http://nugewus.pbworks.com/w/file/fetch/144525402/jitepowi.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144451440/75269137238.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/rick_stewart_pistol_wing_t_playbook.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_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 5892 bytes
SHA-256: 743a5536ff84d5a788f4d96e5dc7cbb5d8888b088c4f42b69defe10ab9a4746d
font_01_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 10552 bytes
SHA-256: ac9142343797a082eb1c8a7a55551f4b452296be81ee6ed6ad12a603082d8e78