Malicious PDF — malware analysis report

Static analysis result for SHA-256 96644d554ca6ddba…

MALICIOUS

PDF

82.4 KB Created: 2021-03-10 12:35:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f90e438466c822e5be3434be2d4e281e SHA-1: 2cce840ab4b3da262c2ef3e34f99d8eee7c241e7 SHA-256: 96644d554ca6ddba5d4fc341fe359801651e47cfd175cfd55c2076fab0e8c506
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 0.9990

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://maypoin.ru/123?utm_term=m.+a+private+date+sheet+2019+ccsu PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fd09c75eced5.pdfIn PDF document text
    • https://guxevelanitab.weebly.com/uploads/1/3/4/7/134769418/2870072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_6041cf3ccb5a0.pdfIn PDF document text
    • http://retamos.mygamesonline.org/3030602408.pdfIn PDF document text
    • https://loniforuwo.weebly.com/uploads/1/3/4/9/134904684/2888936.pdfIn PDF document text
    • https://jopogerepoji.weebly.com/uploads/1/3/5/3/135307159/kudunobulalop.pdfIn PDF document text
    • https://mogefitinovodug.weebly.com/uploads/1/3/0/9/130969954/80f5df89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_603c05e26324a.pdfIn PDF document text
    • https://ladolijid.weebly.com/uploads/1/3/2/8/132816107/51caca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_6036787f1747b.pdfIn PDF document text
    • http://joriwolujuf.sportsontheweb.net/whirlpool_gold_dishwasher_clean_light_blinking.pdfIn PDF document text
    • http://zijafanovidiz.sportsontheweb.net/nursery_rhymes_lyrics_jack_and_jill.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/zavimowubipijuxetote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fijoxim.epizy.com/5232126576.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/easl_guidelines_hepatic_encephalopathy.pdfIn PDF document text
    • http://gobipubefosoja.epizy.com/xepijiferadomojufipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2108e43f-80b9-4e42-b8c1-df27d305e7ec/kodezunelanirexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81093ca4-756c-4fc2-b2c0-4633451e1f88/subway_surf_apk_hile_indir_cretsiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c4dc45-2b9e-45e6-befe-b2d16ff59b18/9444739993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a5e141-ab85-49d7-a8c0-089d410e2e59/el_hombre_mas_rico_de_babilonia_george_clason_gratis.pdfIn PDF document text
    • http://xusexupilaru.epizy.com/company_logo_design_cdr_file_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/xekijalu.pdfIn PDF document text
    • http://xukokumo.myartsonline.com/bhagavad_gita_complete_book_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/best_android_games_with_controller_support_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 2868 bytes
SHA-256: 961dc1380210bdc02715716d6a7e97355048e34260408ad82901b2fe81a5fac4
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 5708 bytes
SHA-256: fc2e06d2c4b362b7929025a6897fbeeaa47be11112e6f5d7ced4873e1087c4d6
font_02_sfnt_off00011782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11782 10620 bytes
SHA-256: bfac14f496626c7157c1abe1d58dcd83cd6225a7e6157006eea4542ff4c6d3b1