Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc7313bd3f7cae8…

MALICIOUS

PDF

64.1 KB Created: 2021-02-04 22:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 643b223dd7e154fd20f9e30f657d0d26 SHA-1: 9b439a637469f2928f95ef8878c63aab66f6dcbb SHA-256: fbc7313bd3f7cae8ed700652914a57b9b63cd66174dd3481c0c9c5762bb2d2e5
156 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDFs. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malicious redirection scheme, likely involving JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=coleman+fold+n+go+grill+accessories PDF link annotation
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/garinosup-nipejatozadikuz.pdfIn PDF document text
    • https://tedarotola.weebly.com/uploads/1/3/1/4/131482933/nodojamilenet.pdfIn PDF document text
    • https://tinuwese.weebly.com/uploads/1/3/5/3/135300683/tipisevide.pdfIn PDF document text
    • http://lisojuribopuwad.22web.org/android_webview_javascript_open_browser.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/4160463.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/jcjePaW/favafoniripulud.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/50U7NW5/48608699914.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ERggzgi/fikivododik.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/takurugilij/11480295047.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/948475722.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/td_online_assessment_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/83323056332.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/ccleaner_pc_2019.pdfIn PDF document text
    • http://wamowif.rf.gd/cinema_hd_apk_for_windows_10.pdfIn PDF document text
    • http://fawepajemug.rf.gd/59163012856.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_off0000beb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB7 5248 bytes
SHA-256: 05159d7a0186ada2efc5a738bd52167390fb2c7de1721620a0ca999cf80511f2
font_01_sfnt_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 10380 bytes
SHA-256: 1ff7e537bd859d34493b5e700641e7dde101acaae7a420605759504a815ef86e

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