Malicious PDF — malware analysis report

Static analysis result for SHA-256 238aa833af397251…

MALICIOUS

PDF

38.2 KB Created: 2020-11-06 23:37:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: cf2e22ad9532e56bb3f4172e99f7bf01 SHA-1: 368420d88dee309af8c99bb00401bf9605c95e93 SHA-256: 238aa833af397251df26c622a846ef0dda31f7a815f0c35b44562e2c070fc28b
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://traffine.ru/aws?keyword=netgear+c6250+100nas+firmware In PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/3656188.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/53425fc8f80e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5fa0ec5db3647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_5fa1f38185f98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5f90358e209d4.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/d5735.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/sagob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/608f57b5-cd8d-451f-9ce5-cf072b62565b/72740388580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96f458b-7797-491a-a804-9686a64b741e/96752120411.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/dirt_bikes_2019.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_off000054a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54A3 5832 bytes
SHA-256: b864f531dd35415047db4dac451d42cad243009eff4a1f6fc33d4c609d80d20c
font_01_sfnt_off00006894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6894 10584 bytes
SHA-256: 57cde94fd21500a5af839ff1a4d4a4cf607701ce596d2cb9871371f4fe7ffbc3