Malicious PDF — malware analysis report

Static analysis result for SHA-256 115308ba5b051863…

MALICIOUS

PDF

39.9 KB Created: 2020-03-13 08:09:23 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8d7dda32e901675be15fe704fc7c1dc1 SHA-1: 382c012f3cc901e2abb560976aacf570d86c3054 SHA-256: 115308ba5b05186315062c6be7c47b8981e1705f31bccecee2eb7baffaa376cd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are numerically-slugged PDFs, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded URL and the numerous other links suggest the document is a lure to download further malware or redirect to phishing sites.

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://autodiscover.themodestshoptx.com/uploads/1/3/0/9/130969724/130969724.html#how+to+solve+algebra+equations+with+fractional+exponents
    • http://angryselfloathingbabies.com/uploads/1/3/0/7/130738628/9772642.pdf
    • http://backcountryvibes.com/uploads/1/3/0/2/130272880/5f4fa3c1534f17.pdf
    • http://goldpriceweb.com/uploads/1/3/0/6/130639905/dc55b1ad25a652.pdf
    • http://arduinista.org/uploads/1/3/0/6/130639544/211310c6a12.pdf
    • http://bluequestmgr.com/uploads/1/3/0/3/130313081/palizoju.pdf
    • http://stlouisattorney.net/uploads/1/3/0/6/130621785/c85179576dd65.pdf
    • http://www.qix-project.com/uploads/1/3/0/7/130740376/gegawalu_lurapogobe_muzinuvomuweza.pdf
    • http://nancywijnants.com/uploads/1/3/0/7/130775274/21045ecd0.pdf
    • http://dmorrisonlove.net/uploads/1/3/0/8/130874231/baruwo.pdf
    • http://www.thevigilgroup.org.uk/uploads/1/3/0/7/130738650/95b4e649.pdf
    • http://newlingpodiatry.com/uploads/1/3/0/8/130813518/mogevopo.pdf
    • http://clinicalconcepts-ky.com/uploads/1/3/0/5/130551310/338747.pdf
    • http://somersetfoodtrail.org/uploads/1/3/0/8/130814168/c4a038b554e1f.pdf
    • http://m.transformationlifecoaching.net/uploads/1/3/0/7/130776891/basuvitazupo_pubok_karibi.pdf
    • http://spreadscience.org/uploads/1/3/0/7/130739377/lurebuladuximaz_sudobolibo_senegovufolivi.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_off00006ed9.bin
31eb3cb7c4421ce0d40bc291677c104751bdf403a819eea594cb649002c5c8b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED9 9116 bytes

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