Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a349043b33a1f66…

MALICIOUS

PDF

31.2 KB Created: 2020-06-12 08:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef3d3a872b8ad0994a9a5313ddf028c9 SHA-1: 426c1c41ae834084f3424e4a1f1519ee40cae958 SHA-256: 4a349043b33a1f66c2843b1f64da3f1bdbf65909a537eedf9ba6c0947606d8b7
94 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to a network of websites that appear to be part of a link farm. The 'PDF_SEO_LINK_FARM' heuristic specifically identifies this pattern, suggesting the document's primary purpose is to drive traffic to these external sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the link farm is sufficient evidence for a malicious classification.

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://leguyule.br3h.com/uploads/1/3/0/5/130542831/130542831.html#paulo+coelho+pdf
    • http://redhotyogastudio.com/uploads/1/3/1/4/131453990/busas.pdf
    • http://budgetsaavybling.com/uploads/1/3/1/4/131454807/wewadimeg_bexovezajode.pdf
    • http://blackwolftshirts.com/uploads/1/3/0/6/130620861/nojut.pdf
    • http://sarlaventures.com/uploads/1/3/0/8/130813651/8524638.pdf
    • http://thewomensdefensenetwork.org/uploads/1/3/0/7/130739927/3016d8105d9.pdf
    • https://bolivuxane.files.wordpress.com/2020/06/pukovuwobitalonoro.pdf
    • https://poxenatus.files.wordpress.com/2020/06/8418062089.pdf
    • https://mipogenulefi.files.wordpress.com/2020/06/44601155631.pdf
    • https://kidubivo.files.wordpress.com/2020/06/18788761560.pdf
    • https://zuvarore.files.wordpress.com/2020/06/41585403765.pdf
    • https://wivutotob.files.wordpress.com/2020/06/fikosupinulosazixupizazek.pdf
    • https://sexisoto.files.wordpress.com/2020/06/33600066959.pdf
    • https://zigonafi.files.wordpress.com/2020/06/wagowejupukebipumot.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_off00005182.bin
c8e48183a7b0b29433b105c0251945db0ef5a9269e5f7c231bf4bbdb0acdecf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5182 9508 bytes

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