Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb63d1f3d54c40a…

MALICIOUS

PDF

108.0 KB Created: 2021-03-22 10:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcdcf58eaa3d29e39842e5bb21728ab1 SHA-1: 7b2584101ce1ecc2edef86b3d5b77e123b001821 SHA-256: 9cb63d1f3d54c40a0bd49ca722feacb0b8dd9b4d60713cdecf97ff732b108682
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL suggesting a search query for a music album download. This pattern is often used to disguise phishing attempts or lead users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

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://dafemum.ru/wix?keyword=tyler+the+creator+flower+boy+full+album+download+zip
    • https://cdn-cms.f-static.net/uploads/4404739/normal_5fe69673448e1.pdf
    • https://cdn-cms.f-static.net/uploads/4383687/normal_6041ca2f9bc8f.pdf
    • https://cdn.sqhk.co/sunidajep/hbegjeP/67907395951.pdf
    • https://cdn-cms.f-static.net/uploads/4384470/normal_600d002593531.pdf
    • https://cdn.sqhk.co/padirazemi/UjhEfgd/84973823473.pdf
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5fe8d9fdbc3df.pdf
    • https://cdn.sqhk.co/jivazufevi/gFsxthd/vutugod.pdf
    • https://cdn.sqhk.co/denidugabuni/kybydSu/cds_2_2019_exam_form.pdf
    • https://static.s123-cdn-static.com/uploads/4444095/normal_5fc6aa7a5d938.pdf
    • https://cdn.sqhk.co/lalamiteliw/idXhgic/41330325635.pdf
    • http://larokamexi.sportsontheweb.net/21919229944.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pibajuwi/yealink_t46g_admin_guide.pdf
    • https://s3.amazonaws.com/pazerogasarinu/60725407307.pdf
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_f331c7c149434092a0e8412196ac5c73.pdf?index=true
    • https://s3.amazonaws.com/zebarufuridorur/29129085112.pdf
    • http://wojibikifi.myartsonline.com/persuasive_speech_about_bullying.pdf
    • https://s3.amazonaws.com/nitidadufetenu/platform_metallic_silver_shoes.pdf
    • https://s3.amazonaws.com/pivetuzadujo/property_appraisal_letter_template.pdf
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_d3c4e7e75cbe4f85a73bf4861b9bc91f.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015103.bin
3bea7bcfd5b6df1ce6475c154ee47e93ba962dd5f621ad80380acec79407328b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15103 5548 bytes
font_01_sfnt_off000163d7.bin
3ab343d4625c41b790aaa2f47355b74d4a2e28be9b12c5f4feca508893a5dd9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x163D7 12060 bytes
font_02_sfnt_off00018d63.bin
792b17e2d8b7926bbf982488bb4a17e77740ea3a38fff94c5bbd2958d4a1dfd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D63 16120 bytes

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