Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b95634c0cbba406…

MALICIOUS

PDF

68.5 KB Created: 2021-02-15 20:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 115a79a8e3541bae5da153aea7a91e20 SHA-1: 8b17dc1029f9e9f815795b0b1bdcffca34776c5b SHA-256: 0b95634c0cbba406e6b592637b271c38fbc9216cf66ba43b3aa8c192eee6ccae
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=troy+bilt+tb516+ec+blade+replacement PDF link annotation
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/9678180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_6011900088613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_600b9c0ad8563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378153/normal_600853da31be9.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/jupimuzatikasogit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463529/normal_6015144d4ba96.pdfIn PDF document text
    • https://cdn.sqhk.co/kasunelebak/l9CjdyX/8496749508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462345/normal_6026bf9b96d69.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/luvir.pdfIn PDF document text
    • https://cdn.sqhk.co/lojavowi/R2w3eIY/67249462090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_5fd3426f50a81.pdfIn PDF document text
    • https://cdn.sqhk.co/tolademapati/WEAwWih/age_of_ottoman_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_600b126565de1.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/bejeseja/94651763310.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/68584571974.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/31275076243.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_off0000ce06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE06 5564 bytes
SHA-256: dbbeec1cf619147ec17b038586a2aa76b1a4029af0d59ee1807535ce62742a47
font_01_sfnt_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 10616 bytes
SHA-256: c8864fb6f7b9e37defd2a41a6441723ed2a0cd390207fb5c9254c1c18bd195cd

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