Malicious PDF — malware analysis report

Static analysis result for SHA-256 d201b9a1479ec6b5…

MALICIOUS

PDF

40.6 KB Created: 2020-04-01 17:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2344773bc7a20fabe97ad32206df9a08 SHA-1: ae238b487838ebee889a0aff6d5599f2b0b48cf2 SHA-256: d201b9a1479ec6b584730d5d16ed8a82845bbc20ea5077581f1239527928b9d9
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains that appear to be part of a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, contains references to academic material and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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://floridasnowicecream.com/uploads/1/3/1/4/131453177/131453177.html#libro+ecologia+cobach+sexto+semestre
    • http://arsdoceopress.com/uploads/1/3/0/3/130379289/6708996.pdf
    • http://carasoul.com/uploads/1/3/0/6/130639863/6301372.pdf
    • http://aclosbanos.com/uploads/1/3/0/2/130287866/tiwovimogegosox.pdf
    • http://sarahpalette.com/uploads/1/3/0/8/130813428/4703076.pdf
    • http://callkevin.net/uploads/1/3/1/3/131384373/5395889.pdf
    • http://500palisades.com/uploads/1/3/0/7/130776042/xujozexewekuzid.pdf
    • http://www.resink.net/uploads/1/3/0/8/130873996/soxatibu.pdf
    • http://rividynservices.com/uploads/1/3/0/6/130640061/7537586.pdf
    • http://hongx2.net/uploads/1/3/0/6/130639807/83ed84b753cf99b.pdf
    • http://seed-to-fruit.com/uploads/1/3/0/9/130969346/1505313533b7c6.pdf
    • http://simyasuaritma.com/uploads/1/3/0/9/130968996/nemuboka_kukojon.pdf
    • http://mirigubler.com/uploads/1/3/0/9/130969051/7fdbc0e11dbb22.pdf
    • http://kennedyfarmsohio.com/uploads/1/3/0/7/130738740/8632600.pdf
    • http://digitalveriteproductions.com/uploads/1/3/0/6/130621378/gixepakag_butapesisawo.pdf
    • http://sandrawimbish.org/uploads/1/3/0/6/130604195/dafewujerof_wegarofonun_sebuxojukinigu_xisidi.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_off000060a3.bin
526f9fe4ac0c3c34e2b73bd0348e2d6c9e35577eb504a1e5c0397f5d11bd9b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A3 9108 bytes
font_01_sfnt_off00008149.bin
5b09643308ce03c2274d251bc862117e4e3106bca29f7b9d9ef54ef878cbb553		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8149 5872 bytes

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