Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fc213cc91fbe96…

MALICIOUS

PDF

76.2 KB Created: 2021-04-09 18:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f69e43736dd3a08a2443ea9289166295 SHA-1: 45f7ec0fdc9e4bd78ecbf91b53051257fec44aea SHA-256: b2fc213cc91fbe965f1b5135c49a04b39e7f3cbab70bb2cffa01dfd481919cc3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially malicious content, possibly for SEO manipulation or to host further phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/strik?utm_term=rifleman+dodd+audiobook PDF link annotation
    • https://cdn.sqhk.co/dukizukijire/YhcnOgj/fatipirugis.pdfIn PDF document text
    • https://cdn.sqhk.co/fafegatoko/je39iWM/used_car_tax_calculator_california.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/XBhdzgi/cnc_meaning_nutrition.pdfIn PDF document text
    • http://clubstore.pro/64560276617lgjbw.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/jjRibie/59105077446.pdfIn PDF document text
    • http://sodalabs.pro/how_to_solve_total_cost_functionue40e.pdfIn PDF document text
    • https://cdn.sqhk.co/naboxolat/gEgfuwk/download_video_player_hd_720p_isaimini.pdfIn PDF document text
    • http://telemprom.xyz/nikon_d5300_manual_focus_videoj9ba6.pdfIn PDF document text
    • http://logvoz.ru/36945883549oy3cx.pdfIn PDF document text
    • http://formverifiedbadge.com/how_to_convert_0.04_g_min.m3_to_lbm_hr.ft3q5v1b.pdfIn PDF document text
    • http://ductsunlimitedins.com/excel_vba_if_statement_with_named_rangeaznha.pdfIn PDF document text
    • https://cdn.sqhk.co/tedefoso/66Mhjji/best_love_ringtones_2020_telugu.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/jekilamozodinegotuvapo0cc0f.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/ijfgWjc/41518165586.pdfIn PDF document text
    • http://twenty-promo2020.ru/3721737748156zdj.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/68cdbf8b-a8ee-4387-a742-010f66b58700/poulan_pro_chainsaw_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d8e5fa-9f42-4ea3-8c22-7e19070ede52/what_is_a_black_and_decker_workmate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f6666c-6034-401f-939d-b33a251a849c/la_esposa_que_ora_dia_30.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e5fceb-b33d-457b-8b7a-1af1f0c27d79/zinizutezezosefiz.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_7ff294267371496fb3c36caf62dabc56.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_e7f8ee6fa47b4c139ed7e6b987a2d76d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c77906-068a-4031-8c25-c4503f5382e1/esquema_amplificador_crown_xls_2500.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_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 4988 bytes
SHA-256: 7feec37d5c31889d19aa1ab6a02997f5123d7694ba466bb92cba0b594e0453c7
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 10412 bytes
SHA-256: cb714dae85583e9adffa42e09b0b925681b03ad648d36bf5dd02b939511392ae