Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3d2974d7ed210d…

MALICIOUS

PDF

44.6 KB Created: 2020-03-31 03:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 12896941568d8336e40418eb49aff538 SHA-1: 4e365ac5b458c4cb79f82975e48a65783cc77831 SHA-256: 9d3d2974d7ed210dfd975557a7908a34b5fa50455f66bcff4f84dd5d74c91ba3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

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://annpreps.com/uploads/1/3/0/8/130873982/130873982.html#funcion+de+cada+organo+sistema+nervioso
    • http://davidfert.com/uploads/1/3/0/7/130776015/1851787.pdf
    • http://augustiner.org/uploads/1/3/0/9/130968976/158032.pdf
    • http://todopatio.com/uploads/1/3/1/1/131163787/6960687.pdf
    • http://bettering-me.com/uploads/1/3/0/7/130739891/4067499.pdf
    • http://theturmericsecret.com/uploads/1/3/0/5/130540583/mobuxixutexixudaxe.pdf
    • http://everesttoaisle2019.com/uploads/1/3/1/4/131406154/8399515.pdf
    • http://americanteachersacademy.com/uploads/1/3/0/3/130324206/dozorax.pdf
    • http://reclamationmarketplace.com/uploads/1/3/0/7/130776312/viwisovi_kiritepigewi_gunewep_gakofodalinigu.pdf
    • http://urgentcareandpediatric.com/uploads/1/3/0/8/130813420/9399805.pdf
    • http://antiquerugimports.shop/uploads/1/3/0/7/130776113/795a5a54bad.pdf
    • http://kathrinecarnahan.com/uploads/1/3/0/6/130639972/guvixebebubu-panejekabox-soxobevojolodi.pdf
    • http://miaimeifs.com/uploads/1/3/0/5/130543537/lakon.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_off0000849b.bin
8a496f297cfc046265644a43ea3db756b3c5b2d73584b0e6698ddf7f2a0dd601		 pdf-font-stream PDF embedded font (sfnt) at offset 0x849B 8636 bytes

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