Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee4ca53d3420a5d…

MALICIOUS

PDF

77.2 KB Created: 2021-05-20 17:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d842860095f6c6b5707635f797e72c65 SHA-1: 28398b6386da639882a642921f171c103a782bc7 SHA-256: aee4ca53d3420a5de02001b8a7fbb41cc2a799dbddc4808e03ba134325e16f0a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are related to software downloads, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=call+of+duty+black+ops+zombies+apk+%252B+obb+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370299/normal_6050c8c322188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_6040332faf992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_60462c17f0363.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484365/normal_5ff4e1c3f2517.pdfIn PDF document text
    • https://tovejuzu.weebly.com/uploads/1/3/5/3/135398771/72e3bbb632b0ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_605fb5141f7b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_60338c23661c4.pdfIn PDF document text
    • https://funotagikaxu.weebly.com/uploads/1/3/1/8/131857914/49b03c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_601716e114d2c.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/5d95fb91-cca2-4c36-82d0-ad1249a5350f/69007595548.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/who_installs_retractable_awnings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7197af96-4aa8-41b9-ae70-562ceb1d482b/how_to_find_cvv_number_on_sbi_credit_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7101eccc-ee23-40e5-973d-f3475fdb4381/final_fantasy_tactics_gba_job_class_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf0d3e3-5ca7-4088-b0af-2765d423d6c6/73618471474.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/46185600299.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/25707179681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da23ae8-73c4-48a1-ae07-5dd3aceb8996/what_skills_do_preschoolers_need_to_learn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dec6b94-f6a7-4bf3-9fc3-c31c628ca863/taco_bell_burrito_supreme_nutrition_data.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/gowodarezapusesulexufidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a53a4e-f11d-48fa-9c35-860383697cbf/how_to_set_up_a_luxpro_thermostat.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_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 5560 bytes
SHA-256: 4d8ecc41fe97f440cb78ec098a8c43b7f1d220f2810b8d9df63424b7af5b488f
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 11076 bytes
SHA-256: 924a20d3cf899cb8d9d4d2022de46ad34750b85580d558f1de06ebd7f49f6746

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