Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c3571a7df45691…

MALICIOUS

PDF

40.9 KB Created: 2020-04-01 11:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0adca49c70b2f0c9126aa02eb426d409 SHA-1: a3d3b3d2eebe7770215641218b0e8ad075ce751f SHA-256: e2c3571a7df4569186f402362806982afaa6cce10064a333fa77be80e6e55a4c
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDFs hosted on various domains, a technique commonly used for SEO link farming or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the intent to leverage a network of linked documents.

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://killaboxing.com/uploads/1/3/0/9/130969204/130969204.html#10+oraciones+con+sujeto+simple+ejemplos
    • http://statsclothing.com/uploads/1/3/0/6/130620464/wafabanewodigajijuzi.pdf
    • http://churchunltd.org/uploads/1/3/0/2/130271114/lovedaroxaj.pdf
    • http://melaniebatesphotography.com/uploads/1/3/0/7/130776131/xalen.pdf
    • http://g7esports.com/uploads/1/3/0/2/130289782/6509897.pdf
    • http://msdanahamilton.com/uploads/1/3/0/5/130551615/2598195.pdf
    • http://maritimtforsoegscenter.dk/uploads/1/3/0/6/130622029/nodawazil.pdf
    • http://terivo.com/uploads/1/3/0/5/130541346/mavapoke.pdf
    • http://crikro.com/uploads/1/3/0/4/130489350/dowozax.pdf
    • http://74-123-77-222.mgwnet.com/uploads/1/3/1/0/131071033/3124140.pdf
    • http://christine-smithdesign.com/uploads/1/3/0/4/130477193/lovojavidenizipo.pdf
    • http://westysciderdonuts.com/uploads/1/3/0/6/130605493/3679605.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_off0000744b.bin
bda038c8b7085b815fd473cbbd7c2836fbf42383027fa47f316eec5d71901f2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x744B 9072 bytes

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