Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53be34b794f031b…

MALICIOUS

PDF

75.5 KB Created: 2021-03-22 16:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e6c524eac42dc5118cecca5eb29204a7 SHA-1: 4b71995c15d3344ca5ae7a3de27c2e86ba142464 SHA-256: e53be34b794f031b86e5853e240e5529c7e5947eeb1fea19d624ee8043ba9b3f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary URL, https://vilenefex.ru/award?keyword=collateral+agreement+pdf, is suspicious and likely leads to malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/award?keyword=collateral+agreement+pdf PDF link annotation
    • https://cdn.sqhk.co/sexuzoropa/bi0wijh/agri_commodity_prices_live.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/WjgFdgf/97843443694.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/71251025751.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/pazakexoreberuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/tiluzegata/S3jiggX/sim_toolkit_application.pdfIn PDF document text
    • https://zisibunekotif.weebly.com/uploads/1/3/4/9/134902626/jubolokumupefupix.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/GQgfqEp/tennessee_titans_record_last_year.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/is_covid_getting_better_in_illinois.pdfIn PDF document text
    • https://simepatu.weebly.com/uploads/1/3/4/2/134267103/efe17538.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/9872ab70-44b2-4980-b463-b79506927709/xemokuwatovikila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f9f209-d5ef-4482-8a41-5817aa01675e/95998577268.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/washington_state_unemployment_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dbed160-2771-453b-9d08-75f7438847da/70231209207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bffde624-76c7-493d-9457-400b2667af6e/52064485114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa660d73-b608-47a1-92ee-77ebcf569660/temizisezena.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/chemistry_cooling_curve_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f99d7c-e364-4df8-a82b-e2c947959361/where_did_a_dolls_house_take_place.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/60497110583.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/refacciones_para_podadoras_de_pasto_manuales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d10190-a1f5-4dc0-ac78-a1dcdb7e8aea/will_final_fantasy_remake_part_2_be_on_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/polycarbonate_roof_sheeting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/354b0ca0-c313-4bcf-8baf-cc953cf2e2f6/gelewi.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_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 5088 bytes
SHA-256: 0742f2855700af03a8215a3b44ecd9d7a7feac8ea9f83e084e8898b002e69650
font_01_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 9888 bytes
SHA-256: 374502de172494bc1396f8ae0779bcd26cc538313b4e64a3aae5bbf5da180e40