Malicious PDF — malware analysis report

Static analysis result for SHA-256 73674ce39de4667a…

MALICIOUS

PDF

52.7 KB Created: 2020-03-29 01:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 50b7a1afd4eee9a9f86a593eb0d80bff SHA-1: 50d77f17f19888175bb7a3a32675ed3535e7328e SHA-256: 73674ce39de4667ab267ff35eeea705e54ac3d1ee16d8311bb4c86c652131e8f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or content distribution network. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains garbled text but includes one of the external URLs, indicating an attempt to direct users to potentially malicious content.

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://nuohotel-zh.devsite-1.com/uploads/1/3/0/5/130588246/130588246.html#audio+lingual+method+classroom+activities
    • http://mediaverse.global/uploads/1/3/0/6/130604230/vitodapananevil.pdf
    • http://wileyeasd2019.com/uploads/1/3/0/3/130323409/lepiwerilawipof.pdf
    • http://vatprocessingoffice.com/uploads/1/3/0/6/130639061/5594220.pdf
    • http://www.storylabinfographic.com/uploads/1/3/0/9/130969404/fekukudefivabemo.pdf
    • http://www.blackskyconsulting.net/uploads/1/3/0/2/130273872/rixepu.pdf
    • http://magadha-cattery.com/uploads/1/3/0/6/130639950/nobut-lijej-gukuxega.pdf
    • http://valhallaparacord.com/uploads/1/3/0/6/130639084/widewudo-fazavab-mufazelugede-nokeji.pdf
    • http://mail.aasvehiclesolutions.co.uk/uploads/1/3/0/6/130604782/0d45d.pdf
    • http://coburgfire.org/uploads/1/3/0/6/130621893/zepakexowuzuf-xuzus-sumizojilag.pdf
    • http://coffeencinnamon.com/uploads/1/3/0/7/130775792/fupirifina-sepapewonud-bazit.pdf
    • http://imeqynr.sites.logojoy.com/uploads/1/3/0/7/130739393/3bdbd15dd.pdf
    • http://coloradosroofingspecialist.com/uploads/1/3/0/3/130379239/nobimovuzikup-dufejek-zuxorolirawis-zadagefix.pdf
    • http://s-kyj.b.butterfly520.com/uploads/1/3/0/4/130475984/kafefimavifun.pdf
    • http://fw1.meleneyequipment.com/uploads/1/3/0/9/130969438/wozaboludom.pdf
    • http://autodiscover.conniefay.com/uploads/1/3/0/7/130775401/fipop-dewiza-xemusozopunud.pdf
    • http://gerecconsulting.com/uploads/1/3/0/7/130739578/faniguxapefopa-gudodexuxusafo-tozunos-wovibozazedax.pdf
    • http://imranyusuff.net/uploads/1/3/0/5/130589094/7caaa43f3821aa0.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_off0000a501.bin
06e1888a7374a079455e25d60bb58f52dbc55614079eaa5e5f46c6cc234a6d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA501 8396 bytes

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