Malicious PDF — malware analysis report

Static analysis result for SHA-256 260efbc8e9fc2b2d…

MALICIOUS

PDF

39.4 KB Created: 2020-03-22 07:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d1207cb9e3cb90344bc049746d6bd317 SHA-1: 24e66b18bad85543b401a849f89af6441927d9ef SHA-256: 260efbc8e9fc2b2d3c7b1da308bca1522398d22f7555246d84b1935674f819e2
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various PDF files hosted on different domains, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness.

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://backstage.one/uploads/1/3/0/7/130738798/130738798.html#obras+de+teatro+ejemplos
    • http://hipnosremotional.com/uploads/1/3/0/6/130604098/c5214.pdf
    • http://practicallyperfectsince1990.com/uploads/1/3/0/7/130739227/1a0e22c8981f.pdf
    • http://www.theblondefro.com/uploads/1/3/0/9/130969984/wubepokuz_finesad_xipibo.pdf
    • http://westsidewater.ca/uploads/1/3/0/6/130605396/jenajufen_mupisesuludoxud_tobup_zudawerik.pdf
    • http://tempotempo.no/uploads/1/3/0/9/130969993/7327112.pdf
    • http://breckroadbc.org/uploads/1/3/0/8/130874108/lifekoka.pdf
    • http://www.elden.com.au/uploads/1/3/0/6/130620168/919bd192f.pdf
    • http://purecannabisinc.com/uploads/1/3/0/4/130435833/refaxenamutoxul.pdf
    • http://armandomoralesalamillo.com/uploads/1/3/0/3/130323675/2760593.pdf
    • http://reviewweiver.com/uploads/1/3/0/6/130620525/1589582.pdf
    • http://www.teaching-with-class.com/uploads/1/3/0/6/130621741/d46d31b.pdf
    • http://ejmcllc.com/uploads/1/3/0/5/130588644/feligimu-rizuniziluno.pdf
    • http://tennis-osttirol.com/uploads/1/3/1/0/131070434/zevetijomav_vevolima_lidojupi_kanam.pdf
    • http://dogsrulesj.com/uploads/1/3/0/4/130488934/zuwidegevo-wevuzer-fobefotuvepabek-bezaligu.pdf
    • http://lattesandmore.com/uploads/1/3/0/6/130639960/2469901.pdf
    • http://littlerednotebook.com.au/uploads/1/3/0/5/130588425/a5112eb31.pdf
    • http://ohanaguidance.com/uploads/1/3/0/7/130775634/5661880.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_off00006f70.bin
3e05c101d3a62f2537dda69baa2623609d75016f5eb233240614fc1fd2d52237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F70 9200 bytes

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