Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7623ba48b9b353a…

MALICIOUS

PDF

46.5 KB Created: 2020-11-06 13:00:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 386c5534a2f742602eff1a3f374858ae SHA-1: cef4f9ce3aba621a0cb297b9ab99dc338089a50f SHA-256: c7623ba48b9b353a27297bdc48616b9c00a14bfe86312cc35865ff28891442a1
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://traffking.ru/123?keyword=facetime+app+on+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376598/normal_5f9501639cc76.pdfIn PDF document text
    • https://pibemalogodozod.weebly.com/uploads/1/3/2/6/132681910/4a7931918c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_5fa4be8fcbc4b.pdfIn PDF document text
    • https://zupipozove.weebly.com/uploads/1/3/4/5/134589893/1834107.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/rufikinapemut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f8a9cd761781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_5f9117a292b01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/bsf_recruitment_2019_notification_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/temejupikiponazin.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/65951703338.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/wuwunesuniwibeg.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/62071131666.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/alliance_global_products.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_off000075ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FF 4728 bytes
SHA-256: 6a00bb8ba57b70479a34047c2dffb3862769589099fe0afdd9c417fd6c9317bf
font_01_sfnt_off0000860c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x860C 11520 bytes
SHA-256: 13e7f536dda7442ce578b7a5e86c6855ca0a6cc947109bbbf9f267219c494920