Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefcfd4e8ecae188…

MALICIOUS

PDF

97.5 KB Created: 2021-03-14 16:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2664a94c298fd0b5a1fdee0a8893cce5 SHA-1: 9a124c220bc08b24805225ec2347ac137a9debce SHA-256: eefcfd4e8ecae188b0706562c8179f9b076bb21d474643d35fad48c65e32d4ae
206 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. It uses an "enable content/editing" lure. 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 0.9996

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://botokaw.ru/strik?utm_term=what+do+you+do+when+your+roku+remote+doesn%2527t+work PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406223/normal_603d00a4b6286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_602a6f02080d2.pdfIn PDF document text
    • http://uaregroup.com/65931398017ivq72.pdfIn PDF document text
    • http://igbusinessabouthelp.com/bajepoxefurp45xk.pdfIn PDF document text
    • http://formulamoney.top/cdr_to_jpg_converter_software_freeucvxo.pdfIn PDF document text
    • https://fefirewaw.weebly.com/uploads/1/3/0/7/130775199/baxubule.pdfIn PDF document text
    • http://steelsho3.club/lizutigapamopatcqd.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/punasa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c65dcfd1-9e77-4969-8503-eaad9be165d5/nuxeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b023ea-7c1d-4f97-a94d-9cc8bdb0ede5/consider_the_infinite_geometric_series_1_6-1_10.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/midaxoduwugalogoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b85ec6-722b-4cbf-9d80-72e9160b259b/11572843179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa54678-85eb-4707-a429-69d903791521/kenmore_elite_upright_freezer_door_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39d436e-be5d-4621-9345-5275934be3ca/98454737147.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/appointment_book_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/godejawasi.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/33358066416.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/android_studio_project_files_missing.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/winrar_min_ph.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/jafodanutu.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/gloomy_sunday_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/how_to_pair_panasonic_phone_to_base.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_off00013c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C61 5340 bytes
SHA-256: bf38c2c110ef5e8267a0a48ff4466aa53f4969e632a695d280c767c30fcef2d0
font_01_sfnt_off00014e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E80 12368 bytes
SHA-256: 85b581237b7fdb05776d43da7be2a064e79426ad9124e9eb1a37983f7168160c