Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5be43a3bd8a7d0d…

MALICIOUS

PDF

43.8 KB Created: 2020-11-05 18:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 578e65c5fce6bf4bff02c9d207ce270d SHA-1: fdc64a8ab0ff485df4eed2d1b1e42bc5cb47be84 SHA-256: a5be43a3bd8a7d0dde86ced5217ce7eea2b3bc21dee6c8c60884d84f31678ff4
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?keyword=ge+profile+arctica+manual PDF link annotation
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/6382800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_5f9fc8653b011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_5f8cfdbebbffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_5f9af4b790904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_5f93eff4cc053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_5f9097c414129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_5fa36dde92058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_5f8c8587769d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f9e4f6031370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453909/normal_5f9f585c71ea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f8e6c42dd728.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/dixaleko/standing_wide_grip_t_bar_row.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00007e8a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7E8A 21452 bytes
SHA-256: c3116cbcac5a39bee1daf6564f0b2c7e32f9b3fef8ffa699c61026b53dce5d55
font_00_sfnt_off00004a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A80 5012 bytes
SHA-256: 41dcb779b0f779178209bd1df9bd2175bcefd049354ff616259f262ac35aca63
font_01_sfnt_off00005b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7D 10284 bytes
SHA-256: 9cfb92333bbfcfb81b46d9962f68a940e8d82e6839da8f27aec8d39384c7d851