Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e6e43bd991dd41…

MALICIOUS

PDF

71.7 KB Created: 2021-02-15 09:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c1d191367d07969fb0d98fd71af5cd0e SHA-1: 2b44e9e9ace0386ac8ecfd842f37f6b834312b9a SHA-256: d2e6e43bd991dd41d3b639edd9ec5118e90a720de739e9dfd44255b33b0aee4c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with one critical link pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content or phishing sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=stickman+battle+fight+cheat In PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/wozebuwi_fekom_lofafovamepa_saduvitapezage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485930/normal_5fd7a04a1863e.pdfIn PDF document text
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/zuvavuwologovomox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_5fe953e275473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408463/normal_5fe41f9d19581.pdfIn PDF document text
    • http://jopimutedu.iblogger.org/46131781685.pdfIn PDF document text
    • http://rabevazilogu.iblogger.org/apricot_dress_size_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367925/normal_5fee408477dc6.pdfIn PDF document text
    • http://repair-planshetov.ru/bbc_iplayer_android_failedfe261.pdfIn PDF document text
    • http://online-sistem.site/recommendation_letter_template_word_docgzvw1.pdfIn PDF document text
    • http://gejopuzebizovuk.iblogger.org/nepowelepidevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421215/normal_5ff685e3001b4.pdfIn PDF document text
    • http://ita-fitness.fun/jozagedye8me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lebasadalo.epizy.com/bootstrap_template_dashboard.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/google_drive_apk_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/external_hard_drive_reviews_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/spring_framework_file_example.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/langrisser_mobile_soldier_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/38580995089.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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 5328 bytes
SHA-256: d8d5c2455e1cb77979529486b15188edb1c8d0a0b15cbe6077c6381490b53481
font_01_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 10360 bytes
SHA-256: 89db34dc7c8eb996bf3bd0fc3066b9800a67f3d71ce1c4775ddac3847a34c62e

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