Malicious PDF — malware analysis report

Static analysis result for SHA-256 9373735cda513c80…

MALICIOUS

PDF

42.6 KB Created: 2020-11-07 00:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 880fb9c28bf0180073bd1c2ab23d6f48 SHA-1: a6d70bad985facf4fd315c7f0306afcd96160cca SHA-256: 9373735cda513c809ad999c3688cef0177567127bf48dc67dceef139aab7c6bd
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=classical+music+instruments+list In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5fa09da8273be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_5fa1717e28990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_5f9484e77e669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_5f907d34e1c7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384307/normal_5f9cc436b19e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5f90947aa1e04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5f888be248760.pdfIn PDF document text
    • https://kafigibedup.weebly.com/uploads/1/3/4/4/134479504/ganolafisutedew.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/1314851.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.pdfIn PDF document text
    • https://ximubemoxib.files.wordpress.com/2020/11/55456386416.pdfIn PDF document text
    • https://fomaxunuroz.files.wordpress.com/2020/11/gipuxixijim.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_off000068cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68CF 4848 bytes
SHA-256: cc58f62f33224ffd2d2c663dafdb951ff77f5fa3d078e0f147aa97a0614a9496
font_01_sfnt_off0000792e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x792E 10716 bytes
SHA-256: 62f640c2b42fcdf94de9469a124107172cfe0237a4c43c244ce1c19232d768a5