Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d7d3798349a7bc…

MALICIOUS

PDF

37.8 KB Created: 2020-05-22 21:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3c2ff1e8a290e59643851d61e4b8bba SHA-1: b4b0589c67187b7a62f494c2b591f69f7cf12bed SHA-256: f4d7d3798349a7bcf58ea10a2cec0fa1f7283335e5b1aa5fecea647a91eae517
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click on these embedded links, which likely lead to further malicious content or phishing pages. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vps7-internal-admins.pleasingfood.com/uploads/1/3/1/4/131452976/131452976.html#microprocesadores+y+microcontroladores
    • http://kennedy-korner.com/uploads/1/3/0/8/130874090/5540371.pdf
    • http://slsproperties.org/uploads/1/3/0/6/130621802/jegif.pdf
    • http://lifeinsurancetylertx.com/uploads/1/3/0/6/130605396/goxado.pdf
    • http://deepfaithapologetics.com/uploads/1/3/1/4/131408738/3012367.pdf
    • http://salateenrestaurant.com/uploads/1/3/0/2/130288456/vimixikipuz_dugawofaga_lizifefij.pdf
    • http://hvacelectricalplumbing.net/uploads/1/3/1/4/131483336/wilovijegamazugu.pdf
    • http://indyfacepainters.com/uploads/1/3/1/4/131437099/zodumi_sokijugagepopug_difinexudafesu_zunomiza.pdf
    • http://shiatsuhands.com/uploads/1/3/1/3/131398582/fodobaparel_vosoxopem.pdf
    • http://armedintrudersafetyschool.com/uploads/1/3/0/7/130775987/3946883.pdf
    • http://foodietee.com/uploads/1/3/0/6/130639530/2156991.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_off00006579.bin
bb596ec17a48b7a918a77878aa971fc57d1d5c4f3ff685d9dbe5149a4c41e170		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6579 11420 bytes

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