Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b7745ac43bf1f0…

MALICIOUS

PDF

39.6 KB Created: 2020-09-30 20:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: da66e8f869263efb6d4fe33221d1c06d SHA-1: f2dc1266286e9d1aceee88dc10e18c8714613ca3 SHA-256: 97b7745ac43bf1f0c249b10093b75dbe018c9b7e7cb1264c51c5bd5565feb488
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://gettraff.ru/strik?keyword=genetic+disorders+worksheet+pdf In PDF document text
    • http://mamuw.calvary4you.com/uploads/1/3/1/6/131607063/6603947.pdfIn PDF document text
    • https://site-1036945.mozfiles.com/files/1036945/detadiwedof.pdfIn PDF document text
    • https://site-1037044.mozfiles.com/files/1037044/gawarixo.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/23897b49-a294-48dd-95fa-d66409feb284/sukuvijaxogopezotozofomub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae266522-b25f-472e-9359-95da98b01c14/59564212427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b993fe78-0f0c-4a12-a5f2-da267c194fb0/najobudebuvifibixoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7dbda9c-3285-49b2-bf7f-526145274b5c/ragax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b667497b-c066-410b-9a3a-4d33659ad34e/sofosuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1fd940-cd0e-40f9-b4a8-58505fb160a6/52836322895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89158e92-a1cb-4cd7-8260-a7196cc04eec/bolufeduvipujumo.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_off00005d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7A 5188 bytes
SHA-256: 808d8cb9e1bd76e78c2b115e569163ac5822318f4dfc4a4390c0c1bc6608a462
font_01_sfnt_off00006f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3A 10272 bytes
SHA-256: 9ccc693387f474ecc283dab7fde8375597fe6c14fd88a7de3d954091856a4b09