Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1b6804b02effdd…

MALICIOUS

PDF

71.1 KB Created: 2020-11-22 18:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54a7a3f369dd851d54e499f333fdf1fb SHA-1: d089b6c3d7cf33eb4145472a103459630f546d85 SHA-256: 6c1b6804b02effdd7a2d1371470f8bd521dcb650554e261931f4f08f12001cd3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, which can be abused for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/aws?utm_term=asean+integration+report+2018
    • https://tivexafo.weebly.com/uploads/1/3/4/3/134348633/figines_vebaf.pdf
    • https://cdn-cms.f-static.net/uploads/4383695/normal_5fa99c4cd9c3c.pdf
    • https://zumavekuganupa.weebly.com/uploads/1/3/4/3/134366180/vagagolev.pdf
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f88424392894.pdf
    • https://cdn-cms.f-static.net/uploads/4477164/normal_5fa84a3093a71.pdf
    • https://sinevojixataxer.weebly.com/uploads/1/3/4/1/134131740/nomifalazojeva.pdf
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/ketesemixudi-vusodo.pdf
    • https://cdn-cms.f-static.net/uploads/4446155/normal_5fb8badb2212a.pdf
    • https://cdn-cms.f-static.net/uploads/4383921/normal_5f8f8442709eb.pdf
    • https://cdn-cms.f-static.net/uploads/4416918/normal_5fb32fee6a81b.pdf
    • https://jixobufasov.weebly.com/uploads/1/3/4/3/134324480/8224425.pdf
    • https://cdn-cms.f-static.net/uploads/4493917/normal_5fb55dbfa2b99.pdf
    • https://cdn-cms.f-static.net/uploads/4489402/normal_5fb3c5b1490a5.pdf
    • https://vufufibujirefe.weebly.com/uploads/1/3/4/3/134355905/b944fd2104fbc1.pdf
    • https://cdn-cms.f-static.net/uploads/4500200/normal_5fb34040d1dd7.pdf
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/1bf39b9a3285f.pdf
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/bexanara_ludewo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d945.bin
4557a41d00e87d46ae69aac9946fce8022bd05645752f691a8331cbeb548e68e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 5464 bytes
font_01_sfnt_off0000ebea.bin
8508e43ed40b52824cd7668c7736ec2f1a2672f224ce5e1ab700d18129e151cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 10408 bytes

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