Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ac384277a3aa3b…

MALICIOUS

PDF

75.0 KB Created: 2021-04-29 04:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 255ce0deca6eeee2878030ad9256dd5b SHA-1: f0f35fe1d3eee9b600660d0c85797908d7518ba8 SHA-256: f7ac384277a3aa3b7f123ea4c701e71626d136021b108f2801bd811d615fc576
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external URIs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=que+alimentos+puede+comer+un+diabetes+tipo+2 PDF link annotation
    • http://reform-st.ru/logitech_m325_mouse_no_lightlhcqk.pdfIn PDF document text
    • http://teksalle.xyz/a_decent_cup_of_tea_book5j1t4.pdfIn PDF document text
    • https://duzajitoji.weebly.com/uploads/1/3/2/6/132680922/9457084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_603108710ad35.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/dujopuvixu.pdfIn PDF document text
    • http://circulyarkadigital.xyz/230480708444dwr6.pdfIn PDF document text
    • http://intekzafast.online/is_grandma_got_run_over_by_a_reindeer_on_disney_plusk5js3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443801/normal_5fe2d2a25b648.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/chinese_language_in_english.pdfIn PDF document text
    • http://zijafanovidiz.sportsontheweb.net/ranufijefefifazuxoniti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_606adea749ccd.pdfIn PDF document text
    • https://dozisinabi.weebly.com/uploads/1/3/4/6/134646642/letimipapiram_puwigixotekipe.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/47475124960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_606a4605cd67a.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/tikipakokow.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/bafudizusemadizepem.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/fd48fa00-29c7-46e7-b0d7-f6734bf90825/yard_machine_550ex_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fffa968-57e0-4cc8-8b78-2e68589598fb/what_is_step_5_of_the_accounting_cycle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8bdc5fa-b589-4cda-b4f8-8f456b70a19f/inductive_analysis_in_qualitative_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53aeef78-a0bd-4f6e-9c5d-b4b8bbf3031d/the_complete_book_of_birthdays_july_24.pdfIn PDF document text
    • http://jifisuxevizek.myartsonline.com/vanetewuneriboxa.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_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 5552 bytes
SHA-256: ef7151516f4c39c790d5f32290992d18c7d628c87a8552d6a7407a1be8af7eb3
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 11048 bytes
SHA-256: 524c571a51c147065ac473b0a985871b338f6fdcd6c3f109ab8656ad9e55061b

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