Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7a424a077cf79b…

MALICIOUS

PDF

45.5 KB Created: 2020-05-21 07:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b893683437c8247a525487dc45aa898 SHA-1: 4ede1a39f14e3d72cb91b04c876adab8ec2c9473 SHA-256: fd7a424a077cf79bbb5ca3c6a6c55ca277d5a0914486f3a7008b6753bfd260a5
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, suggesting a link farm or redirection scheme. No scripts were extracted, but the primary attack pattern appears to be directing users to a multitude of external sites.

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://yvettemarieministriesklim.com/uploads/1/3/0/6/130640097/130640097.html#basit+regresyon+analizi+ekonometri
    • http://helloronellee.com/uploads/1/3/0/5/130590243/24572a8e4854bd.pdf
    • http://righttodreamusa.com/uploads/1/3/0/2/130271137/7897258.pdf
    • http://angelwellness.net/uploads/1/3/0/3/130379711/goduduzuroj-vitiginokow-xolugaj-nuvoginigazomus.pdf
    • http://activated-potential.com/uploads/1/3/0/5/130550998/cbc9ac014973.pdf
    • http://bestroofcleaningkirkland.com/uploads/1/3/0/5/130588961/tomivutigu.pdf
    • http://naturallooksolutions.net/uploads/1/3/1/3/131380504/bavepise.pdf
    • http://kangameplay.com/uploads/1/3/0/6/130620923/ludavo.pdf
    • http://melaninvancouver.com/uploads/1/3/0/8/130873973/viroz.pdf
    • http://jackhammondjr.com/uploads/1/3/0/4/130476340/c28777.pdf
    • http://teamrubiconbook.com/uploads/1/3/0/8/130874189/nalapu_xumekatara.pdf
    • http://americansatelliteservice.com/uploads/1/3/1/1/131164556/c3857c8829d58.pdf
    • http://ilmavetu.com/uploads/1/3/0/4/130483733/puvav.pdf
    • http://dio-training.com/uploads/1/3/0/7/130739117/f2d3d523ea39d.pdf
    • http://epowermath.com/uploads/1/3/0/2/130288710/sosavobujinenunomobi.pdf
    • http://vazzopromotionalproducts.com/uploads/1/3/0/8/130813798/b63461da.pdf
    • http://ifmatters.com/uploads/1/3/0/7/130739686/jumugewefibemu_zopuzewurabe.pdf
    • http://investingmakemesick.net/uploads/1/3/0/7/130740232/nunapidivov-bububebigizelu.pdf
    • http://quitment.com/uploads/1/3/1/6/131606569/mevifozapoborisi.pdf
    • http://cowle.de/uploads/1/3/0/2/130270777/bd54f68ba379.pdf
    • http://labausa.com/uploads/1/3/0/6/130604744/7493873.pdf
    • http://lgifarms.com/uploads/1/3/1/4/131437375/rubavotef_xarofe_refaweg.pdf
    • http://grselectric.com/uploads/1/3/0/4/130483572/puganasodoga.pdf
    • http://zappaexperience.com/uploads/1/3/1/8/131857383/1229430.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075f1.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F1 1800 bytes
font_01_sfnt_off00007e7d.bin
831414e375c4fa9ab8ca80236644ae8915a95b0a40df728823f8f814786bd09c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7D 13936 bytes

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