Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a11d8b84de8643…

MALICIOUS

PDF

68.5 KB Created: 2020-11-09 23:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2cce4245aff20e5e7c9258470aeb0419 SHA-1: 89b0ddc93a89b791e13635d85d93b3e4fb19b931 SHA-256: 52a11d8b84de8643d285b184a75a89d11d5bbc456bd535059800a1ca9411d4b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, suggesting a link farm or redirection mechanism. The primary external URL, 'https://trafficel.ru/strik?keyword=homelite+2500+psi+pressure+washer+manual', appears to be a lure to disguise the malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

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://trafficel.ru/strik?keyword=homelite+2500+psi+pressure+washer+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5fa14dfeca202.pdfIn PDF document text
    • https://memupenenukef.weebly.com/uploads/1/3/4/5/134527104/390373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5f9b330e83934.pdfIn PDF document text
    • https://libadelalisam.weebly.com/uploads/1/3/4/5/134579317/acfebe5e1dc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_5fa623e785863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420743/normal_5f9e84739df1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_5f9c9df41b6e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5f8d49d97ab5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5fa07fac171a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_5fa57c97a6395.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/zeworibuzoza/latin_kings_manifesto.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/ledimizufeteludoxifil.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_off0000ce26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE26 5508 bytes
SHA-256: ccd0de1daea4baee9ea9d4ba970195efcd6f6eea7c6e5fbc38cb1d745d0f5511
font_01_sfnt_off0000e0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 10568 bytes
SHA-256: b14c8ca811e6acb7ab8196e3a91a55313e5ee5ef30237fc1612c2ed3f2fe499f

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