Malicious PDF — malware analysis report

Static analysis result for SHA-256 a590a4ebc527e623…

MALICIOUS

PDF

52.8 KB Created: 2020-04-09 05:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d76c09fbdda7625cea9b6a77783350f5 SHA-1: 479e56743d68c16f5b5083a370651e753732e5a9 SHA-256: a590a4ebc527e62349e429c002651a9657d5035feb30fe0b2c353efb7807b3fc
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 various domains, many of which appear to be part of an SEO link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of seemingly unrelated PDF documents hosted on these domains, likely as a distribution or obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://growfoodnotdebt.com/uploads/1/3/0/6/130639474/130639474.html#phase+diagram+of+fe-c+system
    • http://carbondaledandelionday.org/uploads/1/3/0/6/130639941/7549271.pdf
    • http://perceptivecharm.com/uploads/1/3/0/6/130621740/1839691.pdf
    • http://decidellc.com/uploads/1/3/0/9/130969946/6980930.pdf
    • http://autoclassiccar.com/uploads/1/3/1/0/131070786/nejijitugekusisupux.pdf
    • http://sandreed.com/uploads/1/3/0/7/130739032/2865081.pdf
    • http://creativegenius2.com/uploads/1/3/0/7/130775222/toredade_wunuro_bozasatasere_pawat.pdf
    • http://sunviewhills.com/uploads/1/3/0/8/130814601/sawur.pdf
    • http://leighalexander.org/uploads/1/3/0/6/130604025/lawiben-tofeberonuxo.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_off00009823.bin
9a117c8b1fb36a2e164d3d789cf3873be5281d069d1a30e90ad9f85938aa5ebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9823 9196 bytes
font_01_sfnt_off0000ba9f.bin
9f5082701ede3b34412025578f3613d16372f7e661c8785cd8d7b7f4cdd3c0ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9F 2800 bytes

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