Malicious PDF — malware analysis report

Static analysis result for SHA-256 26735a72d45e9cbe…

MALICIOUS

PDF

76.6 KB Created: 2021-04-06 15:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2ceac18084e4f97f40d4cd4577bd49f8 SHA-1: 2524a0893a28c95997dc2ff10d438d20a607f987 SHA-256: 26735a72d45e9cbe8048f887b305efb9447bf99ea44847b6e1f7d7b3d7dc08ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous external URIs, with a notable one being https://jumiwimov.ru/strik, suggesting a phishing or malware distribution lure. The presence of a link farm on disposable hosting further supports a malicious purpose.

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://jumiwimov.ru/strik?utm_term=murray+lawn+mower+blades+42+inch+deck PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420906/normal_60036b6f7c834.pdfIn PDF document text
    • http://liketime.online/los_30_verbos_regulares_mas_usados_en_ingles7iq0v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485939/normal_5ff8f1f7d05b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_604642e119f77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_5fe73e68e4795.pdfIn PDF document text
    • http://flymoney.net/linear_and_nonlinear_functions_worksheet_8th_grade4nes1.pdfIn PDF document text
    • http://amsidgi.xyz/belkin_n150_wireless_usb_adapter_driver_download_windows_1000e3x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476582/normal_5fe31743117f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469365/normal_6035f49318edd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_60102c855cd86.pdfIn PDF document text
    • http://best-ital.fun/fafsa_eligibility_guidelinest4b16.pdfIn PDF document text
    • http://stat-index-co.com/65963139746ju74c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366388/normal_5ffb145e47dd1.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/630001cb-4d2d-48e1-851d-85e81ac7f3c9/netipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdef9d5-b95a-4675-a39d-96c520e35cea/shark_navigator_lift-away_deluxe_nv360_upright_vacuum_blue_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd39eab9-8936-4501-b0cd-4a9fc3f72ba7/prodigy_autocode_talking_blood_glucose_monitoring_meter.pdfIn PDF document text
    • http://powejuzusar.epizy.com/absage_bewerbung_vorlage.pdfIn PDF document text
    • http://votofeki.epizy.com/65887827040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1003ec30-9130-4e74-8c04-320c51a9b2ef/24949765165.pdfIn PDF document text
    • http://fexodifajeb.epizy.com/54708101599.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_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 5804 bytes
SHA-256: 56a7a3f561578686d15856c4fd5cab4ec5cf2a0d784b6c8f2d7882bf96f9635b
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 10808 bytes
SHA-256: f426990584e80a789f23e42027ba77a05075223d4428f5b80185697fe7e9e530

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