Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d01d7fb82cb8eaf…

MALICIOUS

PDF

45.3 KB Created: 2020-03-29 06:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 385cc66fa6110fd3f7a435260c607b6c SHA-1: cbf69c0ad888b5fdc998c5cbcc0e120d163abf0d SHA-256: 5d01d7fb82cb8eafef3d18d8f29ab0f6b0ab42e60546c9a8a42216288b74cae8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm designed to attract users searching for specific content. The primary URL points to a page that appears to offer a free PDF download, which is a common lure for malicious documents. The ML classifier strongly indicated maliciousness, supporting the interpretation of this file as a malicious downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://ddct-24-4-crs-4g-100m.pleasingfood.com/uploads/1/3/0/6/130639554/130639554.html#html5+black+book+dreamtech+press+pdf+free+download
    • http://wordofthecrossministries.com/uploads/1/3/0/5/130588735/sedexanafa.pdf
    • http://studiobcommercialphotography.com/uploads/1/3/0/2/130272282/844c0bb3e1.pdf
    • http://snapchatwellbeing.com/uploads/1/3/0/8/130874366/ab49a02.pdf
    • http://luumawellness.com/uploads/1/3/0/3/130379696/c51836.pdf
    • http://www.jasminelvazquez.com/uploads/1/3/0/2/130288830/3288ced2f0db76.pdf
    • http://project25.co.nz/uploads/1/3/0/6/130620142/werinek_kitakeforug.pdf
    • http://cocoearlyebay.com/uploads/1/3/0/5/130589309/ladamonot-toxogikazaputu-sowinon.pdf
    • http://ahsredbirdscheer.com/uploads/1/3/0/3/130323937/8515879.pdf
    • http://asopatia.org/uploads/1/3/0/5/130541073/2096916.pdf
    • http://www.gigi-oreficeria.com/uploads/1/3/0/7/130775551/5989705.pdf
    • http://ideoartdesign.com/uploads/1/3/0/9/130969211/jugorugexid_tifutosu.pdf
    • http://blandine-photography.com/uploads/1/3/0/7/130775701/d5767af6437ef.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000875f.bin
de971abc07c56c3d65448ca16261e9ab1cb6c61aa9ab0b47fe3dac98b965a649		 pdf-font-stream PDF embedded font (sfnt) at offset 0x875F 8460 bytes

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