Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30fdf4b65c2d64e…

MALICIOUS

PDF

35.0 KB Created: 2020-03-07 11:12:13 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 273d1b245ce378e0414d80c57ea56b06 SHA-1: 53e7992afe858ab3235436f6f9af46373a2982d8 SHA-256: c30fdf4b65c2d64e5dca0400b2c4c8a3fdbbb42d8140f69e9c8667407067bec1
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to other PDFs hosted on unrelated domains. This pattern is indicative of a link farm designed to manipulate search engine rankings or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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://sembrandofe.com/uploads/1/3/0/6/130639215/130639215.html#english+letters+writing+practice+pdf
    • http://www.discountwiresupply.com/uploads/1/3/0/6/130622073/5676364.pdf
    • http://dimaggioconstruction.com/uploads/1/3/0/5/130590700/xazaremilita.pdf
    • http://vapeheisen-newcastle.com/uploads/1/3/0/6/130605471/fusuwen.pdf
    • http://sdseco.com/uploads/1/3/0/4/130476317/1f82680.pdf
    • http://www.sevenbeeinteriors.com/uploads/1/3/0/6/130639581/3202066.pdf
    • http://bareinsights.com/uploads/1/3/0/5/130550925/5465899.pdf
    • http://mx.dualfisiolinares.com/uploads/1/3/0/3/130313433/lalaru.pdf
    • http://daviddegennaro.com/uploads/1/3/0/6/130604366/nonalozuda.pdf
    • http://www.nashvilletotalimage.com/uploads/1/3/0/8/130813898/98304bdfadfeb3.pdf
    • http://oliverapps.net/uploads/1/3/0/4/130493816/vedisi_nosiramore_nurowel_ririnebubudovi.pdf
    • http://www.blackriverkayaking.com/uploads/1/3/0/7/130739103/2645875.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_off00005f75.bin
054c3f2398ac3703b9587057103593150d34a649e710699ed6bd382066aa4ee0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F75 7652 bytes

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