Malicious PDF — malware analysis report

Static analysis result for SHA-256 0722b848fa3cba28…

MALICIOUS

PDF

72.1 KB Created: 2021-02-28 13:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 430ce3c2ddda1733837073c15e3a45e6 SHA-1: f5ef72847a2837b6779d66a39f8b7eb261a8fbe5 SHA-256: 0722b848fa3cba28980eaedb3703a312b02f871902f66ac1c6a4dd633c1e8474
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 of which are SEO-optimized, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=manual+de+maquina+de+coser+brother+ls-2125+en+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/fogobewataja/B3hekyo/76145603665.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/f1Lhgoy/gwent_deck_helper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408346/normal_600990d7305b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498404/normal_6037a9448ccfc.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/13345928481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5fd61b074bd77.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/nusigiv.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/what_documents_should_be_declared_as_records.pdfIn PDF document text
    • https://gazotudigexeb.weebly.com/uploads/1/3/1/1/131164446/mekadedogukatexewefo.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/wesezuzuvalirik/informix_4gl_training.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/79161464772.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/call_of_duty_modern_warfare_2019_android.pdfIn PDF document text
    • http://buzanuziti.myartsonline.com/46645358356.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/vadexesenewajowubefe.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_off0000d0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 6136 bytes
SHA-256: 22c7949db871ff79f2a155009591e4d26e7b1e5bbae97243009782e9d6668833
font_01_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 13900 bytes
SHA-256: e0cd05b3b4ffce55cc2a314dbd6d4e7c75b15c0066b7527edc02ceae4225226b

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