Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bacc2324ef5d36…

MALICIOUS

PDF

63.7 KB Created: 2020-11-18 05:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ef8768d56dd12d3f0db2995083d7854c SHA-1: b77d2d0ab01304b79606e2b2477c26b7d60e8731 SHA-256: 58bacc2324ef5d3626e74bdc2d0b76df1479259524e9a7b1654258b02ff45f05
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a redirector to known malicious infrastructure. Another heuristic indicates a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

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 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.
  • 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://cctraff.ru/strik?utm_term=ejercicios+radicales+3+eso+resueltos In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5fa6eb00757f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446923/normal_5fa91ff91423f.pdfIn PDF document text
    • https://dawofatodir.weebly.com/uploads/1/3/4/7/134756430/bupitap.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/2d62d980-eb36-4482-a58d-94a5c0eb72c5/22320354379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1ad790e-5182-4362-aae5-806076eb8f01/definition_of_task_environment_in_management.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/27285048543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025baea1-499d-40a7-85de-d668427c7290/36535976538.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/1659980670.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/63376336348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63ff0a68-b507-4cb7-8f58-cc11213680f0/7796642594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16d291a-f3f0-45b4-86e8-4a0e3d30cdd3/free_car_games_for_kids_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b79abf8-95fb-4008-8b6d-eeba8928e999/starhub_tv_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609d4c78-98f4-4b1e-857b-a9bb73a14d07/cfbisd_graduation_2020.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_off0000bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3F 5132 bytes
SHA-256: 34afb49795a764538fb1d4a75f82d82028d1f34ff52ab014d3e4cd7811a594ff
font_01_sfnt_off0000cdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC8 10644 bytes
SHA-256: e1b2882e28260f2dd466c8110f3ccb199037c5cff1e96b359c4ab8b2fb5ad2ae

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