Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52389883787d4a9…

MALICIOUS

PDF

41.0 KB Created: 2020-03-08 10:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 207a9958ab83339c27d2da64f2f85882 SHA-1: 2ef879ced82214d988ab54721b044db188152e97 SHA-256: a52389883787d4a9ad751ef66213f816a52ac52fb1de651e98d21e29232dc953
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDFs with numeric slugs, indicating a link farm designed for SEO manipulation. The primary URL in the document body, 'http://ptxdsm.brdge.org/uploads/1/3/0/5/130551433/130551433.html#trustworthiness+of+the+study+in+qualitative+research+example', also leads to a similar structure. This pattern suggests a lure to a network of potentially malicious or spam-hosting websites.

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://ptxdsm.brdge.org/uploads/1/3/0/5/130551433/130551433.html#trustworthiness+of+the+study+in+qualitative+research+example
    • http://www.jennifergarrett.co.nz/uploads/1/3/0/2/130287878/9090daf794.pdf
    • http://wamits.com/uploads/1/3/0/3/130379231/xapozi_fumorazo.pdf
    • http://latesthindistatus.com/uploads/1/3/0/6/130639061/makukumum_vetobutudob_waximiviwed_zapobitize.pdf
    • http://misterkolani.net/uploads/1/3/0/2/130289427/9100769.pdf
    • http://fontsrock.com/uploads/1/3/0/4/130435862/a7c5cc1.pdf
    • http://carolinaspconstruction.com/uploads/1/3/0/6/130620693/gavowurikuwas.pdf
    • http://thegreatrising.com/uploads/1/3/0/5/130539702/2357811.pdf
    • http://brigitteyearman.com/uploads/1/3/0/6/130639266/4906534.pdf
    • http://greenflavour.co.uk/uploads/1/3/0/9/130969082/e1b38788f.pdf
    • http://arealwinterholiday.com/uploads/1/3/0/9/130969936/vodutodilelev.pdf
    • http://edtech.softutor.com/uploads/1/3/0/4/130489144/pudaxunevozub.pdf
    • http://www.keesforwellbeing.com/uploads/1/3/0/2/130271152/d6d5663ff.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_off000074de.bin
c18076154e20f2239a33bf584d75c4b1115b49032645aa21d3857eb690162fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DE 8288 bytes

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