Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c0928741ca9cfa…

MALICIOUS

PDF

126.6 KB Created: 2021-05-20 02:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bbc52411d669c3292390365a05cb8e6f SHA-1: 88d4cad9e4baa0bc37c510d742b5652493ac28dc SHA-256: f4c0928741ca9cfabb34979b8c587f94cfb295b6038478aab55be0cd8ffa1647
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=watch+call+of+the+wildman+full+episodes+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450418/normal_5fe5459098db8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_6036cd61c7968.pdfIn PDF document text
    • https://mebolosedam.weebly.com/uploads/1/3/6/0/136009811/mimemazitoj_judixowed_bixolatapovuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_6010d42ac3ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_600bb8df64f06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392651/normal_600065f3965ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_60134ef3ca265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475854/normal_5fcaf0f18c33f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469359/normal_602a4bb727e44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450721/normal_604162057e5cf.pdfIn PDF document text
    • https://figeneluniw.weebly.com/uploads/1/3/4/8/134857588/silobomujenewu.pdfIn PDF document text
    • https://rigopijifotifat.weebly.com/uploads/1/3/2/6/132695828/1276446.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/nazekisigiduz/refalubosos.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/ap_polytechnic_lecturers_notification_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/autocad_2007_activation_code_keygen_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/massachusetts_appeals_court_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/missy_elliott_alyson_stoner_2019_vma_performance.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_off0001b6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6C7 5500 bytes
SHA-256: fb93da6b318c882b0c10e59fced3db0015c6491e5165367f606e28b63fe608d7
font_01_sfnt_off0001c96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C96D 10768 bytes
SHA-256: e5b23093d122fa98487f5d8cfc6fac6b6c83bb0abeea694ddb09694467ecd85c

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