Malicious PDF — malware analysis report

Static analysis result for SHA-256 68464cb1e752af69…

MALICIOUS

PDF

67.6 KB Created: 2020-11-25 00:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c9a4a43372f4d85df0fe41fc8760c3d7 SHA-1: 837f79fbcde6c697f9a40dbadfb01d6def642a3e SHA-256: 68464cb1e752af69d40fc72179255ed3f88b37923aabb7c85456c0a6a01477d8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://traffnew.ru/123?utm_term=validus+preparatory+academy PDF link annotation
    • https://weropejo.weebly.com/uploads/1/3/4/3/134321986/xopazawed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_5faad769c68c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_5f9243b8bfe0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wegugus/98629487388.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/95110491522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b23462c-67c9-4775-b6f7-96f7475d4131/70054173166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b0ae2c-78d5-4e5b-b1f4-ba0f6a80d8fb/xukojolawuxepafiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df0de72-05f0-459a-b3da-3fd4f0956819/najivuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ff0adc-161c-4de9-9029-109f7835b56f/87434090316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9dffb7-4d3e-4297-a54d-ed01fd156dfd/zerupusujopogo.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/video_camera_tester.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_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 5284 bytes
SHA-256: 6bf37fd91fa1e9116a6d609fdeef54adada749a0bf5e6ed046e798657d6133a2
font_01_sfnt_off0000db12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 11632 bytes
SHA-256: b503927ffc33f206ab7046d932643ee004b7e1eef103a473acf5f5c65ce0f349

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