Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba459a41aab7c339…

MALICIOUS

PDF

45.0 KB Created: 2020-03-30 15:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32c539557554771957e6393b9145fb12 SHA-1: d4e8a364b4ef622b7b492e03b506996fe8d2ef07 SHA-256: ba459a41aab7c3399459e75d170aee67828d6280fb16834bb87d4c3347c3328f
94 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 PDF documents hosted on different domains. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains seemingly random text and URLs, suggesting it is designed to manipulate search engine results or distribute malicious content through these links.

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://asociacionperiodistaspr.org/uploads/1/3/0/2/130272582/130272582.html#singer+7256+fashion+mate+computerized+sewing+machine
    • http://katreese.org/uploads/1/3/1/1/131163863/6388961.pdf
    • http://jbrianjudd.com/uploads/1/3/1/0/131070498/7051814.pdf
    • http://designgirlplus.com/uploads/1/3/0/4/130488451/gexawuwiwipijub.pdf
    • http://silverrivercoaching.com/uploads/1/3/1/4/131438155/2902558.pdf
    • http://astrokin.com/uploads/1/3/1/1/131164130/folibili.pdf
    • http://therapybycamille.com/uploads/1/3/0/7/130740192/b801f613df98.pdf
    • http://campanilefestival.org/uploads/1/3/0/4/130489448/8dfefaecae3bee4.pdf
    • http://mymagichappens.com/uploads/1/3/0/6/130620650/zagoweruxuwolaz.pdf
    • http://trickhorse.net/uploads/1/3/1/1/131164350/13766e0f1b01.pdf
    • http://karlajotaylor.com/uploads/1/3/0/7/130775796/c6835.pdf
    • http://electrene.com/uploads/1/3/0/4/130483487/3081066.pdf
    • http://batterycfosummit.com/uploads/1/3/0/8/130873849/kugezoveperajagiva.pdf
    • http://lonersnomadsmc.ca/uploads/1/3/0/4/130435962/1495284.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_off00007ef5.bin
c05335fd588ec23ee48fc263afc0f27acc04bdf2ad36d041f7591de742ecdff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF5 7916 bytes
font_01_sfnt_off00009dba.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DBA 1708 bytes

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