Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e7b9954c6f3155…

MALICIOUS

PDF

73.1 KB Created: 2021-03-22 22:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7c5b14f10d5c0bdc480846e2558e0a56 SHA-1: 576470214c5714e95ac4565e86b5ee3356422233 SHA-256: 15e7b9954c6f3155dc5c167eca12936b13e3d1b053731066244d588bec90f337
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://ponafet.ru/wix?keyword=reverse+acting+thermostat+for+exhaust+fan PDF link annotation
    • http://mibikazut.mypressonline.com/6506148105.pdfIn PDF document text
    • http://disozire.mygamesonline.org/gk_capsule_2020.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/mitose_cellule_vgtale.pdfIn PDF document text
    • https://fonabanobegax.weebly.com/uploads/1/3/1/6/131636781/38b1f7.pdfIn PDF document text
    • http://xapowuxif.mywebcommunity.org/dark_force_rising_plot_summary.pdfIn PDF document text
    • https://pevumufaropis.weebly.com/uploads/1/3/4/7/134706438/880630.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/rational_and_irrational_numbers_worksheet_grade_7.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/muvagejilibanukubebim.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/nisafijitowafiwi.pdfIn PDF document text
    • http://lenusabipowezo.getenjoyment.net/8473455375.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/zevexufifu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://riveminigokoxa.myartsonline.com/13200228601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c7a3c7-584b-4cf3-a2bf-3cc133e2b95c/jerubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26508a88-0ca9-46d2-a13f-8a27d78d48cf/9285105096.pdfIn PDF document text
    • http://pexirud.onlinewebshop.net/portrait_of_king_henry_viii_and_catherine_of_aragon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b79a80-9f66-4b33-b70b-f0883a7bb72a/xadowonaruzavafozizemomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dedd0d01-a78d-43a3-82c2-221b542d2437/96822148273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2a06fc-7327-413b-a88c-692057b15484/how_to_setup_rig_for_catfish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e7b2f8-26ed-41a2-a09e-f000cada9529/can_you_connect_monitor_hdmi_to_usb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d57a8cc-5c65-4226-9c45-dac37369d43a/fuser_kit_for_hp_color_laserjet_cp4025.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_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 5280 bytes
SHA-256: 3af6bb920f6eab3572ccbcfadbfef3a7213e03bf245ba50b435321a7b5d719f6
font_01_sfnt_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 10880 bytes
SHA-256: e5bc5ca3df4a95d43ae8ed9192845d264a1fdaadf24db74173c168142513191a
font_02_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71