Malicious PDF — malware analysis report

Static analysis result for SHA-256 7559a875abeb8b37…

MALICIOUS

PDF

66.7 KB Created: 2020-11-10 20:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1118315d2ea842070cdadec7eed4aa03 SHA-1: c805b63f73abef1f506f2de5db4f79e729a9b4d3 SHA-256: 7559a875abeb8b3716413978ebe15c9043a2ac23e0b3cf4a5460bb058368616a
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 as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier also strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm point towards a phishing or SEO manipulation attack. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically.

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://trafftec.ru/strik?keyword=frozen+cake+toppers+party+city PDF link annotation
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/259182.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/lojasilifogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f9e8df982ad0.pdfIn PDF document text
    • https://fatuvubexu.weebly.com/uploads/1/3/4/4/134496757/wufapenane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5f9037c792ce5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454665/normal_5fa0e2d94626a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413113/normal_5fa5282c7fdb1.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/29f93d00-9094-476d-b417-064b0cca4050/oopiri_telugu_movie_download_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f59637b-dda4-45b2-bdd3-547666e4d347/93640363390.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/juveditofix.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/15180591208.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/58817314548.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_off0000c992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC992 5068 bytes
SHA-256: 1e4b9b14715c0ea4bcefbe90add79c1e001998438c37b910d9d78a91ce583a36
font_01_sfnt_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 10216 bytes
SHA-256: 81d7998d996110731669f5ce3d0fe64e0ab0bfcfdbb6828728c34a202063d0ea

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