Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6c2b300d798654…

MALICIOUS

PDF

102.9 KB Created: 2021-05-20 21:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d53a4c5bf9b856868c53c793999e7a76 SHA-1: 2149ac3373ae4791809695fee0f39cf086961bac SHA-256: 0b6c2b300d7986549723a25cf7ce3c4d8ca6231f64e452c50f2b77bd0a3e8bce
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly those pointing to PDF files, suggests a link farm or phishing campaign designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=emotionally+focused+family+therapy+interventions
    • https://cdn-cms.f-static.net/uploads/4390661/normal_605585545e9bb.pdf
    • https://cdn-cms.f-static.net/uploads/4464527/normal_606e202b5ad20.pdf
    • https://static.s123-cdn-static.com/uploads/4416675/normal_5ff5494d0f396.pdf
    • https://cdn-cms.f-static.net/uploads/4487631/normal_5fd7f9f6d7f0d.pdf
    • https://jodalutuz.weebly.com/uploads/1/3/4/4/134444421/77830caa976337.pdf
    • https://xugugizebe.weebly.com/uploads/1/3/1/4/131482894/dilejuwarimofa.pdf
    • https://cdn-cms.f-static.net/uploads/4485807/normal_60601f53e771a.pdf
    • https://sofubile.weebly.com/uploads/1/3/4/3/134380394/zunonemonosotu_figusefugaget.pdf
    • https://cdn-cms.f-static.net/uploads/4491688/normal_5fe9128862011.pdf
    • https://cdn-cms.f-static.net/uploads/4456369/normal_5fd39eb03badf.pdf
    • https://tedofejufada.weebly.com/uploads/1/3/0/7/130775935/850c70501f5d4e1.pdf
    • https://cdn-cms.f-static.net/uploads/4469370/normal_6033218030b17.pdf
    • https://cdn-cms.f-static.net/uploads/4419218/normal_6033a441791a2.pdf
    • https://cdn-cms.f-static.net/uploads/4374545/normal_601128a6cd5a6.pdf
    • https://cdn-cms.f-static.net/uploads/4368976/normal_6009e07777635.pdf
    • https://cdn-cms.f-static.net/uploads/4485313/normal_60524df637679.pdf
    • https://mipedurekarano.weebly.com/uploads/1/3/5/3/135321071/5035fb50322414.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wutogugej/gexebevubulibunakenamupe.pdf
    • https://s3.amazonaws.com/gurupixabogivaz/64032345273.pdf
    • 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_off00015548.bin
1b4f12bc31fdcfa0a0eb5b94d944822baa37db05984b05715b98e23aef56e98f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15548 5516 bytes
font_01_sfnt_off000167f1.bin
889d7ddd3b252b32afd48bc0249038b00f77365caef65ba1374a295f7253eb4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x167F1 10924 bytes

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