Malicious PDF — malware analysis report

Static analysis result for SHA-256 7859cc04facf7878…

MALICIOUS

PDF

85.9 KB Created: 2021-04-26 16:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1b29b37eb15f48ebc156c2a2dd9dd0a9 SHA-1: 2ab466c1aef60f92293d14014501f4216b9aa168 SHA-256: 7859cc04facf787816e5832306a346dd1b41d3ccdb1b8c731f354cd8295dab49
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, including one to 'fokemale.ru', suggesting a phishing or SEO spam campaign. The document body, though heavily obfuscated, appears to reference 'Whirlpool refrigerator models price list', a common lure for phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fokemale.ru/strik?utm_term=whirlpool+refrigerator+models+price+list PDF link annotation
    • https://rixowumunek.weebly.com/uploads/1/3/5/3/135330445/mavuwidipurudi_gosironizip.pdfIn PDF document text
    • https://sojopukav.weebly.com/uploads/1/3/4/2/134266177/a7503d8.pdfIn PDF document text
    • http://myirn.icu/head_horse_horror_game_note9pwaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450345/normal_5fe8ebeb3b1b7.pdfIn PDF document text
    • http://psyhologrzn.ru/japegoxoxaboeag6j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_5fd7d37a3104d.pdfIn PDF document text
    • http://edayafar.xyz/modoloup3cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_6059b09cf00d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_603913b2336ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388420/normal_60466270bacf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_603daabec78b2.pdfIn PDF document text
    • http://rent-nout.site/how_to_reprogram_a_genie_garage_door_opener_keypadq6jb3.pdfIn PDF document text
    • https://gamowova.weebly.com/uploads/1/3/4/8/134881319/nagawaniraxorewu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479254/normal_5fc74c9796033.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/nupidosigewo-dunuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_602535c8aa791.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/fa477052-25a5-47da-b776-2b33c2237af0/duvuxazefubawopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2308c60-ace9-43c6-a9e3-636a9fbe15d3/histria_do_caf_no_brasil_resumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e42dbd-6c60-4277-a7e6-8a7c3be486ee/potipaxilidufubegite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1d87ee6-5ce2-42e8-9254-6709b1c09382/72788742918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df524ff-2cbb-4e76-b1d4-b570b0a0641c/genograms_assessment_and_intervention_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889f212b-b536-4ff0-94d7-030912ab37fd/kojexiponuwotusogiweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c609053-e3ec-4647-8a7a-5096bdaff29f/windows_server_2012_r2_iso_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf34424-9896-4e5b-a43d-5a7321649c3c/nifesibi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 5580 bytes
SHA-256: bcf4f787781ec01d0d0f39d88227359e1ca92671f685e28f011e62309d25f189
font_01_sfnt_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 11060 bytes
SHA-256: e4d9d10c8fdba96c3583f2d1dda70d08c0132262e017f3eeeada7d03fe02aa99
font_02_sfnt_off00013431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6