Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89a1ef44b50343c…

MALICIOUS

PDF

42.8 KB Created: 2020-11-07 08:34:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: d145e378e2772306e0df85c97c1bb573 SHA-1: 38a2cf16057676c8c0a1b44cc089e17fa9934953 SHA-256: a89a1ef44b50343c38f3badadc71587864cceaf12205a9bd0e06f31a8291fdd2
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://trafftec.ru/123?keyword=50+mathematical+ideas+pdf PDF link annotation
    • https://fiwenozagor.weebly.com/uploads/1/3/4/3/134363395/9320899.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mezesodumeli.files.wordpress.com/2020/11/88904628373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eec0c61-77fb-47e3-bedb-a2e5d53224b8/69519916294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4c5a41-c1cb-481e-b1b6-fdcfeed323ca/4714256074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2f2e1b-98e5-47de-ad64-1d78ab301d26/51798503876.pdfIn PDF document text
    • https://rinuwax.files.wordpress.com/2020/11/1149196868.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/petuxupamida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf9cdc8-1c5d-47cf-a3d9-31b14a6880e1/jujidavabodovirejidoreni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3431a57-08ff-4043-913d-8e0197d0f3e7/64564064429.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/65213673807.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_off00006731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6731 5472 bytes
SHA-256: 43de4899f7f6048d1fcfd759790ba8cc2f6d486e48199fb453d2b78fd7c4d52e
font_01_sfnt_off000079a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A7 11620 bytes
SHA-256: f9147953142d8d1f4e2648d42d9576741fedfb62c11def775b83df135a015cfc