Malicious PDF — malware analysis report

Static analysis result for SHA-256 4055dfdc8392ac6a…

MALICIOUS

PDF

35.2 KB Created: 2020-06-03 15:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13cf22b516c5d30c273b25c0b9bc56f7 SHA-1: b542b43e579d542d54ca0ee0980d52f3d3dff6b5 SHA-256: 4055dfdc8392ac6ac587e1313aab7dbedfca6996ed23e4459e503244801e72da
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious File

The PDF file contains a large number of external links, many of which point to PDF files with numeric slugs, indicative of a link farm or SEO spam tactic. The document body also contains a prominent link to 'discovermyrootstravel.voyagerwebsites.com' suggesting a lure to download files. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://discovermyrootstravel.voyagerwebsites.com/uploads/1/3/0/8/130813667/130813667.html#download+wii+iso+files
    • http://sportswebsites.com.au/uploads/1/3/0/4/130435562/90548.pdf
    • http://orphancaresolutions.com/uploads/1/3/0/5/130539427/jaraselixotibo-vugujaxunow-doseneza.pdf
    • http://tinyweddingsoregon.com/uploads/1/3/0/4/130483288/xozimer.pdf
    • http://webdisk.gatheringessence.com/uploads/1/3/0/9/130969710/4197868.pdf
    • http://violetandgrayboutique.com/uploads/1/3/0/6/130604532/gazevuvanavimurad.pdf
    • http://mail.villasundream.com/uploads/1/3/0/5/130551704/zasutawizogeduk-vixefux-wugud.pdf
    • http://erinhoover.net/uploads/1/3/1/0/131070342/4702267.pdf
    • http://mymisswalker.com/uploads/1/3/0/5/130589998/sugej.pdf
    • http://adroitdesign.org/uploads/1/3/0/5/130539295/vubenidesaxeje_sixubik_vovam.pdf
    • http://discovermyrootstravel.voyagerwebsites.com/uploads/1/3/0/8/130813667/terms.html
    • http://discovermyrootstravel.voyagerwebsites.com/uploads/1/3/0/8/130813667/dmca.html
    • http://discovermyrootstravel.voyagerwebsites.com/uploads/1/3/0/8/130813667/policy.html
    • https://mikokapi.files.wordpress.com/2020/06/97191828762.pdf
    • https://zebixapis834988247.files.wordpress.com/2020/06/28467774862.pdf
    • https://malujad.files.wordpress.com/2020/05/66171666928.pdf
    • https://dugazide.files.wordpress.com/2020/05/metuxexasitivanusim.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_off00005e77.bin
91b100a74fbec8d0a7c82d7d62ba31ac55c010e6d13ac766ec4788f494419e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E77 10272 bytes

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