Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db0e5dbb7306302…

MALICIOUS

PDF

70.9 KB Created: 2021-03-01 19:36:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3bb3fd4a5a1afedf4ab1e4da84a1f9ff SHA-1: df2de43fcbb564c106c7c0d533b1b76d2fec8353 SHA-256: 4db0e5dbb73063029e8949dd680b28b460a61aeabf00693cf1e6940cd24df56b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the heuristic firings point towards an attempt to redirect users to potentially harmful content.

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
  • 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.
  • 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/strik?utm_term=rya+sailing+rules PDF link annotation
    • https://maninidepot.weebly.com/uploads/1/3/4/7/134702581/tekudesuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383147/normal_5fe1b5fecab94.pdfIn PDF document text
    • https://pipedexow.weebly.com/uploads/1/3/4/8/134852679/25004e8c18bb.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/82f01cc23abb75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481154/normal_5fe2c2ef6969a.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/la_intranet_metrovias_horarios24phl.pdfIn PDF document text
    • https://ritibamubube.weebly.com/uploads/1/3/1/4/131437410/nutepix-fopukew-lisifanuf-juralusofas.pdfIn PDF document text
    • https://bibutijelogoper.weebly.com/uploads/1/3/2/7/132740620/6107513.pdfIn PDF document text
    • http://ersoil.fun/89947930258ti534.pdfIn PDF document text
    • http://everydayy.fun/oxford_3000_english_words_with_meaningdld5h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462976/normal_5fd13d2a3626b.pdfIn PDF document text
    • https://wunilozufepen.weebly.com/uploads/1/3/4/6/134600637/ba21f.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/24699744431.pdfIn PDF document text
    • http://idealicaitalia.website/why_is_my_clutch_not_going_into_gear3rh2a.pdfIn PDF document text
    • https://pagununida.weebly.com/uploads/1/3/4/8/134861868/ribipezipetisetudof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 4964 bytes
SHA-256: b99503a48c709aa9c5044f8b121495962099b3df5300409bf1c64d878f2ffa6f
font_01_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 10776 bytes
SHA-256: 0374093dcf20fcfbc64957f09a2f22222137aa3c9a97acb4994dcbd986cb8778

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