Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1026a283fc8ecb…

MALICIOUS

PDF

47.4 KB Created: 2020-04-09 11:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ea187ecada33a57ca842f0f1a5f3c9dc SHA-1: 59717bb27588ae35fa2faa72e186d0de60baf353 SHA-256: 4d1026a283fc8ecbebda8ca310f7bbd5787e70f4d0362b46de4ab4dcf582191a
96 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, many of which are dynamically generated and point to unrelated domains, suggesting a link farm or SEO poisoning tactic. The document body, though partially corrupted, contains text related to 'Uaf final exam schedule 2019', likely a lure to entice users to click on the embedded malicious URLs. The ML classifier strongly indicated maliciousness.

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://casacordobaexperience.com/uploads/1/3/1/0/131070904/131070904.html#uaf+final+exam+schedule+2019
    • http://onelastthingg.com/uploads/1/3/1/3/131398507/foxojeranogav-dodexarufadisa-nomugetunirelu.pdf
    • http://themovementsmethod.com/uploads/1/3/0/3/130323596/daed528aa.pdf
    • http://hostmaster.phillongfootphotography.co.uk/uploads/1/3/0/8/130814645/1379106.pdf
    • http://foxbeeksolutions.com/uploads/1/3/0/4/130476573/865597.pdf
    • http://ogdenwestpto.com/uploads/1/3/0/4/130477252/sobedesorutagi.pdf
    • http://organizeubyallyne.com/uploads/1/3/0/4/130489350/vevutalenisoja-widozenotipad-geveto-tilukezib.pdf
    • http://southernrebelboutique.com/uploads/1/3/0/5/130551390/3603086.pdf
    • http://fredachaney.com/uploads/1/3/0/5/130551981/zulimonulaj.pdf
    • http://cbclifefinancial.com/uploads/1/3/0/2/130288481/jilupuwi_wikijefot_perijitoki.pdf
    • http://blueandyellowbowlingbash.com/uploads/1/3/0/5/130588813/1350953.pdf
    • http://renewablesco.com/uploads/1/3/1/1/131164171/4176d1ac.pdf
    • http://wattlecottageartandwellbeing.com/uploads/1/3/0/5/130588202/duwikurelirilujonib.pdf
    • http://inwellhub.org/uploads/1/3/0/5/130588906/4601431.pdf
    • http://thebasquetourcompany.com/uploads/1/3/0/4/130435902/vifukifeg.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_off00009188.bin
483c679043ef85dc98717e2379769f62080143d551a283cb9ef18ee290fa5446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9188 7960 bytes

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