Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90693a87f8ea5b9…

MALICIOUS

PDF

66.8 KB Created: 2020-05-06 06:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d842cc87c8bb525fc8292d8ab954a61 SHA-1: 46ac17b82ed35df67c060fa7e58c33b2bb8c135b SHA-256: a90693a87f8ea5b9d3f8b105eb0bdde2dc136c3a680e98f61ef8529b4752f089
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The presence of numerous URLs suggests the document's primary purpose is to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

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://8128.work/uploads/1/3/0/2/130291371/130291371.html#actos+de+comercio+ejemplos+pdf
    • http://rothschildestateservices.com/uploads/1/3/1/3/131379070/pudopupa-fototo-fojewopanevo.pdf
    • http://prbyterri.com/uploads/1/3/0/2/130289508/f22136a.pdf
    • http://branchingtogether.net/uploads/1/3/1/8/131858353/jirawefugafas_bamelokoxezexuk_gesitelefe_ridumo.pdf
    • http://taylorjstanger.com/uploads/1/3/0/5/130539774/5447020.pdf
    • http://musicbytommyward.com/uploads/1/3/1/1/131164324/00d88a7.pdf
    • http://ledhelicopters.com/uploads/1/3/1/3/131378779/aed8d7cb4a46.pdf
    • http://infinitegoddess11.com/uploads/1/3/0/7/130739349/2191673.pdf
    • http://beauty-health-and-fitness-weekly.xyz/uploads/1/3/0/9/130969331/jufusobuxuxiwikewiga.pdf
    • http://sweetsbowtique.com/uploads/1/3/0/9/130968985/riwuwokiwem.pdf
    • http://primecolorent.com/uploads/1/3/0/8/130813401/pomelesogokubov.pdf
    • http://mccoypropertyholdings.com/uploads/1/3/0/6/130639904/labufiwivibir.pdf
    • http://sherrymoyers.com/uploads/1/3/1/3/131380999/0c8fb.pdf
    • http://chrisjamesrecovery.com/uploads/1/3/0/5/130544089/9967709.pdf
    • http://blindsshuttersmorefrisco.com/uploads/1/3/0/2/130289301/f16967345e584b3.pdf
    • http://in-demand-decorating-rentals.com/uploads/1/3/1/6/131606175/jivijoguvuniduk-tivalebanijew-fegufoni-watika.pdf
    • http://raymondbishop.com/uploads/1/3/0/6/130603688/5243602.pdf
    • http://mccoypropertyholdings.com/uploads/1/3/0/6/130639904/labu
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000d809.bin
55370369e2b737864cf9ae00ef9fe35faab9686aeee86be67fe1e461284f87ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 12800 bytes

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