Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb639300a0bf5a2b…

MALICIOUS

PDF

66.9 KB Created: 2021-02-05 21:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: c820e7833fc92f09cf5a6f082940ca08 SHA-1: 7462e757981eab595c5ea01fead1401bbbb09976 SHA-256: cb639300a0bf5a2b1640063686bdf9de11e2dc9350e8bc8ec17d91f1efdfb997
254 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/wb?keyword=english%20creative%20writing%20worksheets%20for%20grade%201 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_600e402d47b13.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/ib0H9jb/selizewunatel.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/iaAH6E4/34316769644.pdfIn PDF document text
    • https://dotuxebi.weebly.com/uploads/1/3/1/4/131454754/e6bc1ad0f92.pdfIn PDF document text
    • https://wedoweniwan.weebly.com/uploads/1/3/5/3/135308992/rezul.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/pegozegi/barron_s_french_english_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/51145002138.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/dubixefitudavix.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/employee_satisfaction_project_report_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/25885118977.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/jebixakexigubasar.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/3435984280.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/16442599650.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/conjugating_ar_verbs_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/classical_music_sites.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_off0000c8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B5 5508 bytes
SHA-256: a3e0dae09ca0fea47d28391d9ff91b15feacc23ce17e884c2cd8f2c565d62cbb
font_01_sfnt_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 10160 bytes
SHA-256: 26ab841475677a75447a92532b0bea42600ca3cd96846c44f87cba29a669ca1f

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