Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8404fc6211c10e2…

MALICIOUS

PDF

75.8 KB Created: 2021-06-01 22:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 744c679ab6d9b607100b7a83dfb55395 SHA-1: 39c1212436581e66a61277857526c8173643f12c SHA-256: c8404fc6211c10e2a05c4c4738481b8b82baa5864a9e6f6ea6cfddb989aa8f25
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=hello+neighbor+nintendo+switch+guide In PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/5474519.pdfIn PDF document text
    • https://solazipakiku.weebly.com/uploads/1/3/4/5/134509697/lowijijakojokugowe.pdfIn PDF document text
    • https://wexikapej.weebly.com/uploads/1/3/0/8/130874413/betorerolubumelem.pdfIn PDF document text
    • https://paxisiluju.weebly.com/uploads/1/3/1/8/131858156/6594250.pdfIn PDF document text
    • https://xomuxojevasew.weebly.com/uploads/1/3/4/0/134096468/velukerotijaxo_dagivimaz.pdfIn PDF document text
    • https://nupigefaxobabu.weebly.com/uploads/1/3/1/0/131070289/runoboluwurop_jaxawoz_vatizuxamodofaf.pdfIn PDF document text
    • https://gesaseli.weebly.com/uploads/1/3/1/3/131379828/xosekibubuvus.pdfIn PDF document text
    • https://luriwopowilexat.weebly.com/uploads/1/3/4/3/134338936/gejasamekib_doloze_vosuzojazebo_dezitu.pdfIn PDF document text
    • https://rivixemip.weebly.com/uploads/1/3/4/6/134609840/2659428a9b920.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/butokikudabo_buwunewog.pdfIn PDF document text
    • https://wimixexaselu.weebly.com/uploads/1/3/4/3/134324609/pawabo.pdfIn PDF document text
    • https://zodukoweferu.weebly.com/uploads/1/3/1/0/131069906/wemaraxabufem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411426/buwurezomenidelolafulawis.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/best_research_questions_examples.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/lilutixazavasikope.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144414498/vekofezavukafexid.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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 5184 bytes
SHA-256: c52474d5240d89d6cde11ba43326bc7bf82e5616c61f28cb89cb888414334501
font_01_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 10964 bytes
SHA-256: f42540bb6f1d1ead91444d67247b886fa5a598227831f110795f08acf1444173

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