Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff3a8075aa9c5b6…

MALICIOUS

PDF

75.7 KB Created: 2021-02-27 14:00:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 13a1ced0147a5ab28c72c19ba799d701 SHA-1: afeae727174b9beb1d0bff521a1ff974c919a15c SHA-256: 9ff3a8075aa9c5b6e7dc412440aa30ee6ac39e2071fb23eb86a2485d5ccd0adb
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 to benign-looking documents, but one critical heuristic identified a 'link farm' pattern. The primary URL, 'https://mezovuduw.ru/strik?utm_term=kobalt+10+miter+saw+review', suggests a lure related to product reviews. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely for SEO manipulation or to redirect users to malicious content.

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://mezovuduw.ru/strik?utm_term=kobalt+10+miter+saw+review PDF link annotation
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/6cf3d96b5ef97.pdfIn PDF document text
    • http://gimogorox.22web.org/college_website_template_in_html.pdfIn PDF document text
    • http://bivadula.22web.org/notifedumut.pdfIn PDF document text
    • http://foxaxasako.22web.org/70518777796.pdfIn PDF document text
    • http://xipukob.22web.org/xfinity_error_code_rdk-3033.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kubazemaxem.epizy.com/loci_and_construction_gcse_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/b_form_number_means.pdfIn PDF document text
    • http://ziboporo.epizy.com/sipuwurujeb.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/ielts_speaking_2_topics_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/translate_to_english_from_spanish_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/happy_birthday_gif_with_music_free.pdfIn PDF document text
    • http://botozagelexi.rf.gd/36319025724.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/gixilevezutoradi.pdfIn PDF document text
    • http://fefisapuvekebi.epizy.com/47292114145.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_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 5288 bytes
SHA-256: 82777c22d75771f4e92830b8cfeeae05fa0edf6113e91fe7211d392a909cebab
font_01_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 11384 bytes
SHA-256: 2f4f6d33b3d2821326f7842a953ff39f26858df74494333b033d4a04b7ae1eeb

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