Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ffad03c20f0c96…

MALICIOUS

PDF

43.4 KB Created: 2020-03-26 06:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e5456fd282487d562ea143e380883582 SHA-1: 5b67b5f760456e5d9349396118441e54a18e275e SHA-256: b3ffad03c20f0c9683737fc662c4e745e401812a8a5ba4bf930d8eba7a446563
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that is also listed among the extracted URLs. This suggests the primary function of this PDF is to act as a link farm, potentially for SEO manipulation or to distribute further malicious content via the linked PDFs.

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://primbb.com/uploads/1/3/0/5/130543757/130543757.html#acidos+hidracidos+nomenclatura+tradicional+y+stock
    • http://timoyler.com/uploads/1/3/0/5/130590403/sebozo_vaxekagimosiv.pdf
    • http://domadialaw.com/uploads/1/3/0/6/130639624/e492585b7.pdf
    • http://droscarparada.com/uploads/1/3/0/2/130289638/84bf3ca332f4.pdf
    • http://zohrehosseini.com/uploads/1/3/0/7/130739147/6c7ab25.pdf
    • http://kellerpestpros.com/uploads/1/3/0/6/130620970/4f62453874.pdf
    • http://shop.fitnflourish.com/uploads/1/3/0/2/130287989/3676836.pdf
    • http://onenessoregon.com/uploads/1/3/0/5/130551585/xobomuzakiwid.pdf
    • http://naztecsolutions.com/uploads/1/3/0/5/130547373/tavosaxovoba.pdf
    • http://ciencia-sociedad.org/uploads/1/3/0/6/130620987/vupozuxa.pdf
    • http://climatechangecoffee.com/uploads/1/3/0/5/130550724/vumonizat-bigofuweg.pdf
    • http://contrafrank.com/uploads/1/3/0/7/130776737/9eec5.pdf
    • http://sharposh.com/uploads/1/3/0/4/130483809/zedalodefefoki.pdf
    • http://www.techeducation.ca/uploads/1/3/0/2/130289510/5120464.pdf
    • http://www.specscoffee.com/uploads/1/3/0/5/130551339/57b41a0fdb2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006830.bin
87a4c8d29c1421834432777e5bcd1a1cd034750546d0fe3402a9537c0a6aab62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6830 9200 bytes
font_01_sfnt_off0000895e.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x895E 16036 bytes

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