Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55ffccb56ca3e40…

MALICIOUS

PDF

45.8 KB Created: 2020-10-26 06:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 408e1b2ae44c8915af295671ef177928 SHA-1: 4183cb30860622b972d1a40104f81e525cfe9cfa SHA-256: f55ffccb56ca3e407c7b6bab20499aa74a5303deb8c56265293af51384d0ea28
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://cctraff.ru/aws?keyword=proyecto+arquitectonico+pdf In PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/luloxanibi.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/daredorinavon.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/5111a.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/8452231.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/038885c85ecf8f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5f8b1a83a30e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_5f8fcaed94448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_5f9156231d277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409103/normal_5f94cb722260b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f87d8c428bbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08ae00f-4927-4408-98f7-34bfaa339f21/43630721883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/589f1f4f-5a3c-4770-9766-45f703736ba6/juboguxizulurador.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d01af88e-a044-462f-908a-b5e72c68415b/bukofudorilonisafetawevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/000fc82d-b3d8-42e5-8ccf-a4cf362f8533/96139394648.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/2060400287.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/zexoxik.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/bescherelle_espagnol.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/jelokemiwowolimugexekeb.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/77867565000.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/how_to_be_a_woman_caitlin_moran_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/business_plan_template_simple.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/assessment_in_special_education_a_practical_approach.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_off0000732f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x732F 5168 bytes
SHA-256: 888a902f00a10f268f8f20c1806902761807b8a36c84a43c40dceb088901f047
font_01_sfnt_off000084d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84D5 11036 bytes
SHA-256: bd805deee5adb7320aee028bcbf3ae9584f8ec9eae9408309268ad866864a07d

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