Malicious PDF — malware analysis report

Static analysis result for SHA-256 85721ebf959f8eee…

MALICIOUS

PDF

42.6 KB Created: 2020-09-30 13:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 86779db066ccef1836dc005fe85afe47 SHA-1: 333573a635bd6475db42724edeaf67341167cab7 SHA-256: 85721ebf959f8eeee744267c33c9929afb199ae7eac9f45c99b4c392cc7b7f5b
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=handbook+of+space+astronomy+and+astrophysics+pdf In PDF document text
    • https://site-1037211.mozfiles.com/files/1037211/datakuwuzaxorubo.pdfIn PDF document text
    • https://site-1037203.mozfiles.com/files/1037203/limifevij.pdfIn PDF document text
    • http://zaral.ims-spi.com/uploads/1/3/2/6/132696056/2005150.pdfIn PDF document text
    • http://files.yvettefrancino.com/uploads/1/3/1/3/131398091/33f9c28dbaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/32378599802.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/5081/9733/files/argumentative_essay_about_internet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4312/5405/files/91882685921.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9183/6571/files/zuxisotowamite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78f77b0-46ae-4923-bc7f-ee8489d9208f/77883272291.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_off000066c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C5 5632 bytes
SHA-256: 7c55fca6899f6229dbae7e8c90a5de9c28bb139bc62a3fa6477f3d0de86e1e05
font_01_sfnt_off000079c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C7 10492 bytes
SHA-256: 869c212b0ad7d8051729cc37d06a864a8244a1a192f3cc6f7d7cb98abb917336