Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88c241e3b245863…

MALICIOUS

PDF

67.8 KB Created: 2021-03-14 21:58:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2cb56fa067154cc92d614762f663664d SHA-1: 2104d41e8bd5e9e1c813bffc692352cdb5a2f5ad SHA-256: b88c241e3b245863530518a12eb73f922ba99adcd54b090c00506621fe1ebfdd
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=avengers+endgame+wallpaper++for+android PDF link annotation
    • https://degebemug.weebly.com/uploads/1/3/0/8/130814630/ludofalaji.pdfIn PDF document text
    • http://istra-backwater.ru/how_to_restart_a_kenmore_refrigeratorvyy1k.pdfIn PDF document text
    • https://selegisazo.weebly.com/uploads/1/3/5/3/135323244/kanodenunakugifogif.pdfIn PDF document text
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/4c6f2497.pdfIn PDF document text
    • http://afracheat8.xyz/does_sketchup_work_on_chromebook2jgj2.pdfIn PDF document text
    • http://mamajan.space/42553717367gj9pi.pdfIn PDF document text
    • http://coolvdomaion.online/bomewugemadizikomiluvwk5g.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/masa_kejayaan_dinasti_abbasiyah.pdfIn PDF document text
    • http://ferafukapawap.scienceontheweb.net/angle_measures_in_polygons_worksheet_1_answer_key.pdfIn PDF document text
    • http://ecoterritory.store/ge_ultra_pro_universal_remote_codes_listomff8.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/faab4.pdfIn PDF document text
    • http://grampus-shop.com/resistance_tube_core_exercisesob36x.pdfIn PDF document text
    • http://khareedforosh.com/86029639422wbetv.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/etiology_of_atherosclerosis.pdfIn PDF document text
    • https://dibetoxiruvon.weebly.com/uploads/1/3/5/4/135400859/pezimowatemiro.pdfIn PDF document text
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/2380766.pdfIn PDF document text
    • http://sqrab.top/tatkal_booking_formag05d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/posufij/57035535464.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/acting_tips_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/kodubu.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_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 5500 bytes
SHA-256: 1d7a5084f2419a101c4f9efa246e8773f5e1c0d61604bd8896cdcf9d4a86d113
font_01_sfnt_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 10492 bytes
SHA-256: c502759ea44314a65c918470adea4907ddaae45d075eedbb65070578ca17f51c