Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40e6d2f7d4176ba…

MALICIOUS

PDF

81.5 KB Created: 2020-12-25 12:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6f8d9ed635f0b4100b8a9f95e56b9eea SHA-1: 2a8acd0ef4b1ab3845d36beb51a7db81b853dd4c SHA-256: f40e6d2f7d4176ba84de0cda8a4b68140478151d950e3ff741f772f11cda100c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, characteristic of a link farm or SEO manipulation scheme. The primary URL identified, https://traffset.ru/strik?utm_term=cruise+ships+covid, suggests a potential phishing or malicious redirection attempt. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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 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.
  • 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://traffset.ru/strik?utm_term=cruise+ships+covid PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f976c4521fd1.pdfIn PDF document text
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/1866834.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/X0Mham6/fasimijutaripe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5fa42b3187889.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8faa258e-aba3-4236-9a4c-b8e1d307347d/miwurifapidaratotukuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dacc5b27-a637-4083-853d-84c118f0a137/tcl_55p607_55-_inch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be45ba85-cb30-45ad-8b1f-eb81d4ff2e4f/degenerate_conic_sections.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/633d17c5-05fc-46e0-a59d-7763fef1158c/fefunibabalozebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b12065-4d78-4c91-95c2-f3202972ad4b/ohm_s_law_worksheet_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125c8518-17a0-46fc-9fb7-3531bcfd66b4/usps_tracking__evs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf8a89a-2787-4679-9309-1bd6d4f863e9/ejercicios_de_acentuar_palabras_primaria.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 4700 bytes
SHA-256: ecc8f0c96332cc3036ee0c49798f0ea76e668807c90e30f35983b5e08355bf43
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 11164 bytes
SHA-256: 050ec2dc5a38a949f084dc2ce94a23d775f7b921cf6a724784c4fc4091ae93df
font_02_sfnt_off00012b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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