Malicious PDF — malware analysis report

Static analysis result for SHA-256 f477639e7d4228c0…

MALICIOUS

PDF

73.5 KB Created: 2021-03-08 04:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 75f500975ae9fe24666c82cf1495133b SHA-1: 5dcae2bb6d17579336c2faef9674c12465bbacf7 SHA-256: f477639e7d4228c05491f7fb6cbcc9b4d934e54f2b9e651a242c822263b99688
186 Risk Score

Malware Insights

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

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 0.9997

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://crophysi.ru/wix?keyword=protein+structure+and+function+worksheet+high+school PDF link annotation
    • https://jononosafopobof.weebly.com/uploads/1/3/4/6/134649788/refole_ligujo.pdfIn PDF document text
    • http://cashbackmoney.info/live_sports_hd_tv_apk_firestick4ffbi.pdfIn PDF document text
    • http://usacreditmonitoring.info/dell_inspiron_n5010_battery_not_charging01cd6.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/29c2f.pdfIn PDF document text
    • http://euroshopmn.space/online_speaking_english_practice_free_app5xflo.pdfIn PDF document text
    • https://vavetoros.weebly.com/uploads/1/3/4/8/134854671/adf51f4e.pdfIn PDF document text
    • http://imm-shoes2.club/almost_there_sheet_music_scribd6miwl.pdfIn PDF document text
    • https://xidujodoj.weebly.com/uploads/1/3/1/0/131071067/vapovosemixag.pdfIn PDF document text
    • http://yandex-dostav.ru/kalasevavklijt.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/mosezavor/tallentex_answer_key_2019_class_6.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/gosirijafodekosolo.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/44739667243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0fb9c8d-e3f1-49d8-bcae-dbcfc631190c/lista_de_verbos_irregulares_en_ingles_pasado_participio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a412ad99-f792-4c70-882b-0ee8b5b27220/richmond_essential_50_gallon_water_heater_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58b1184-d456-43a8-9226-2b7104c46b0b/war_horse_cast_emily.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19218fbf-44a5-4f92-983e-446aec558b37/dalolemoxazalojowax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48fd10fb-acde-478d-ab90-1c9d9cf813f7/76804156561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c1dd68-8e44-4e22-ad6c-24a69595d265/how_do_i_get_my_bartending_license_in_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de7c2956-e0ce-4f65-81f8-68c2490ab5cf/38719065847.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/poxulorizewemavomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/314be18b-c127-47b6-ab93-2e9c03726cb1/spaghetti_tower_challenge_rules.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_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 5440 bytes
SHA-256: 1d5d3f19701845b3c293f50e9e09ef79c0201e748f099dca75fedcfb667b7fe4
font_01_sfnt_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 10392 bytes
SHA-256: ac0f4963888d490ebf2154f494afc683cf618516d677bc483e1d7fb98ecdcb61