Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f823d9867dade51…

MALICIOUS

PDF

42.7 KB Created: 2020-10-02 07:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f857671b4060c3d707389ba8df30e6ad SHA-1: b8f4cdb4aa80fdc7a0a70ca188b65f654eff06f4 SHA-256: 7f823d9867dade5168e652ecf4254d8e1489c5e974b9e52e6ab6d6c9aaf9a1ba
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://ggtraff.ru/strik?keyword=gallbladder+diet+pdf+spanish In PDF document text
    • http://gobulo.ywcahealthandfitness.org/uploads/1/3/2/6/132681481/d3d4075199.pdfIn PDF document text
    • http://files.vintagevibelou.com/uploads/1/3/0/7/130776386/jalajapalexuwej.pdfIn PDF document text
    • http://files.koahspearguns.com/uploads/1/3/0/8/130813849/worabugesezu_fowipe.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/f4370d46-5dab-4ae2-844e-82804e5025d1/xiwawenekutekiduluxuxuluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4137dc44-06d7-4fb3-9197-ecaebafc565a/dasebix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601fe3ef-45d8-4a90-b229-06a42ac05138/dekaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ee6109-8665-4da2-9b7a-44474ee8b899/navozolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc4f331-61aa-43ba-b73b-2a47b9e4d935/nijenuzoguzefijasimobozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62aca20d-df64-4f4c-b5e7-dcae78b374e1/gavumiwebivipedak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f843f216-320c-458f-b114-5ee0f0069a72/nawexoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a57636f-af6e-49f1-92cf-5d77990b1a51/dakinibufevafujifopoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5844cf8c-6aeb-465f-a4d7-2b6f22e1dfee/dupet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27218056-eae7-43fe-affc-03f0ce74150c/bajojodirowokezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592e097c-2b60-48cd-979d-9d4cb0bdd87d/95666999786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c193edc7-d222-4f66-903c-8317e089d01b/wonaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b32a57a3-1c9f-4f7a-902c-80a47b1eabed/devigabafuvabedavoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bba6a4a-378a-4736-bc6b-a68c4a1fd07a/jidenarogotagesisomifan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33bbbd7-6831-49fe-b088-4039ae3790d0/losujibixugukag.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_off0000689c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x689C 5300 bytes
SHA-256: f7ffc7a3e81dd4bde86a39c920b5f68bbf9f0f50c8fd7d4e10939d9a0b1d3264
font_01_sfnt_off00007a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A94 10352 bytes
SHA-256: f64a55d4c218eb5f3740638f088f81960c203ca0f19d25f0207dd7ed4a18513e

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