Malicious PDF — malware analysis report

Static analysis result for SHA-256 55823940b5bc38f7…

MALICIOUS

PDF

64.6 KB Created: 2021-02-07 07:26:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 17ca75dfff9729e36c2ae083d281e6d5 SHA-1: 99ec7dcc5d054ca8e5ea4f6c914e87743d233e0e SHA-256: 55823940b5bc38f7eea2bf2df3a434b4deb4ede569b5effd51baf3e4f887ea60
196 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
  • 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.
  • 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://druttle.ru/wb?keyword=facebook%20messenger%20cleaner%20app PDF link annotation
    • https://cdn.sqhk.co/sizebadit/hdK6dib/51207306462.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/eLRMgdH/28029766437.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/lJljcjf/two_points_to_point_slope_form_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/gipagigo/ie0f9EM/rogojuvujawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fe9a8ca04932.pdfIn PDF document text
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/junadefojegezot_rarufajizumopis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468571/normal_5fe8392e11438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fd09f71465fd.pdfIn PDF document text
    • http://deutschebank-meine.com/flight_club_reviews_manchesterwlq7v.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/84wgJhf/tornado_alley_movie_2009.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/vavuxekalozaw-bisofivegisisu-jebeguzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420602/normal_5fdd30e225afd.pdfIn PDF document text
    • https://talaxosukizarom.weebly.com/uploads/1/3/0/7/130775084/3918ba0ffadbdb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367017/normal_5ff1787832391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388818/normal_5fded72a17520.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_off0000c113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC113 5412 bytes
SHA-256: 77dbb5b5a84b1ea298b6b1c4da29b33973cd0fd115deaef7eee26e4bc884f604
font_01_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 9988 bytes
SHA-256: 9d7bfb682264929ad9c6c0548aa084342fb980023b1f60a81b92de6f4332d6de

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