Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a47b10f4bd040f…

MALICIOUS

PDF

78.3 KB Created: 2021-04-04 01:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7726143a39b566ef92b6594591ff0d96 SHA-1: 91789987f12baa2e192a1257748b97c7304467eb SHA-256: 20a47b10f4bd040f71ab5616d603ac745a7a23d7422a9cf6a9b9589cd4d4b5c2
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical alert for redirecting to known malicious infrastructure. The embedded links, such as 'https://dafemum.ru/strik?utm_term=what+is+modernist+cuisine', are designed to lead users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+is+modernist+cuisine In PDF document text
    • http://youralteragoods.com/what_are_the_5_examples_of_operating_systemvkbu6.pdfIn PDF document text
    • http://dimupure.22web.org/dbx_286s_review.pdfIn PDF document text
    • http://agent-ritual495.online/2112899452qb7mq.pdfIn PDF document text
    • http://electorat.org/wamureguxokoli01vk2.pdfIn PDF document text
    • http://dompodklyuch.com/mycricket_app_loginil9g1.pdfIn PDF document text
    • http://modebedunizux.iblogger.org/mufumafiburerizipelonovi.pdfIn PDF document text
    • http://fobixoleji.22web.org/changing_the_battery_in_a_citizen_eco_drive.pdfIn PDF document text
    • https://kiwosadil.weebly.com/uploads/1/3/5/3/135384828/jovonipivabik.pdfIn PDF document text
    • http://rubyshup.space/kibuxizabaziznwuln.pdfIn PDF document text
    • http://kekifomixutax.iblogger.org/85149888366.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/4507566.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/3ee6345d-b442-492e-ad84-7b48d6e5e1c3/leguvuna.pdfIn PDF document text
    • http://jibapasugaxelo.epizy.com/letitovimikexapuni.pdfIn PDF document text
    • http://zidufixeda.epizy.com/3348391847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eee28ec-aabd-46c0-ae49-33e2b2eaeb05/lokizaregut.pdfIn PDF document text
    • http://fufagarafe.epizy.com/os_odontoideum_radiology_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4969f7c6-0372-4822-a1f9-79ce9fdd6ed9/how_much_did_paige_vanzant_make_for_ufc_251.pdfIn PDF document text
    • http://lemagokumir.epizy.com/oxidative_rancidity_in_potato_chips_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d7e5fa5-3b83-48e5-87bb-cead038afc73/how_do_i_fix_my_printer_ink_pad_at_the_end_of_service_life.pdfIn PDF document text
    • http://sodokeb.epizy.com/54259742383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46b34be-67d3-4ffe-9353-3769cb3661e6/wanigazupemurowavolexe.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_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 5160 bytes
SHA-256: 7544c1b3745f61059cdb4f22f670e109535a14fd924dde5642db2b38e0cbf4f8
font_01_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 10972 bytes
SHA-256: 7d43a5921ac3b72580c271d61432581b3df00da3ddbb6899be13012f9a2ab603

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