Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d8bedfb8cd9b59…

MALICIOUS

PDF

73.8 KB Created: 2021-05-03 00:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 50316e3d094f7cb664ebd7804ef204b3 SHA-1: 20485a2a40d3c1fc7aa74113b85e0c85918004cb SHA-256: 55d8bedfb8cd9b5956545d791685e4188f2fc8afe3b0f5f4dd0bf7983a1cba40
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous links on disposable hosting suggests an attempt to distribute malicious content or phish users. The primary malicious URL identified is https://yafferge.ru/strik.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/strik?utm_term=can+you+catch+up+on+netflix In PDF document text
    • https://cdn-cms.f-static.net/uploads/4483070/normal_6033d3de622e3.pdfIn PDF document text
    • http://masowetimori.iblogger.org/blinking_green_light_on_directv_tower.pdfIn PDF document text
    • http://markettop.pro/693412269758ab43.pdfIn PDF document text
    • http://winoraama.site/pachislo_slot_machine_for_sale_uknne5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408340/normal_5fe3dee440156.pdfIn PDF document text
    • http://electorat.org/40371239251ili1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_604204df48ae5.pdfIn PDF document text
    • http://powerhdniy.space/37879060291nagew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_604eb7c675e1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_601ae0ad861ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_6043865c5686a.pdfIn PDF document text
    • http://vukabuv.22web.org/documents_required_for_b_form_pakistan.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/80379166-dd1a-42be-b1eb-440c8ee7ec80/washing_machines_repairs_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b433f1e2-4b69-4de6-9571-d52ada0dfbdc/dewen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/483c960e-c34c-42ee-b7e5-bd812c022ced/66069380918.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/a_level_further_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24af0488-72db-4b59-a94d-b63e313c199e/chemical_compounds_ionic_and_covalent_bonds_worksheet.pdfIn PDF document text
    • http://mozutebileba.rf.gd/buwabofube.pdfIn PDF document text
    • http://naxefugoxodikow.atwebpages.com/unir_varios_en_uno_mac.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_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 4904 bytes
SHA-256: 25d5c2623637877cb2f33e17e03428d5fcdee9a11e7e8714c4ec016006e67872
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 11376 bytes
SHA-256: 7b89dfbf8b3c65dd9119155aaaf6ca83d8110ea78a7b890ffeb9bc5733163938

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