Malicious PDF — malware analysis report

Static analysis result for SHA-256 8171bf01eb0389c9…

MALICIOUS

PDF

38.0 KB Created: 2020-04-06 07:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 57139b65230630e53db92317306ca9ca SHA-1: 378297ba680b89d1eb76bac5e296712fbbfa14d7 SHA-256: 8171bf01eb0389c9139473f640249f6e05aa49356a769ef6bc44633446e8e1ac
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links to various domains, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs supports this assessment. The document body, though partially corrupted, contains a URL that is also present in the list of extracted URLs.

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://vajessholden.com/uploads/1/3/0/4/130483805/130483805.html#test+de+estilos+de+aprendizaje+para+nivel+primaria
    • http://largotermiteinspection.com/uploads/1/3/1/1/131164297/253613.pdf
    • http://tradewhisky.net/uploads/1/3/0/2/130291646/c507f3062.pdf
    • http://mycladdagh.com/uploads/1/3/1/3/131380908/4046063.pdf
    • http://lilahidalgo.info/uploads/1/3/0/2/130270924/bilizu.pdf
    • http://storytimecorner.com/uploads/1/3/0/9/130969506/74d507.pdf
    • http://dasoulolife.com/uploads/1/3/0/7/130738569/7922909.pdf
    • http://aerialprotectivesolutions.com/uploads/1/3/0/5/130542734/370bd0d9e13552.pdf
    • http://enc2135julia.com/uploads/1/3/0/7/130739495/9254178.pdf
    • http://saseducation.org/uploads/1/3/0/2/130287504/7ae74d7ac.pdf
    • http://busromeling.com/uploads/1/3/0/8/130814351/5244252.pdf
    • http://hedrick.us/uploads/1/3/0/6/130620375/4e7840a.pdf
    • http://livemusicgozo.com/uploads/1/3/0/7/130739086/9111361.pdf
    • http://tubeshoes.com/uploads/1/3/0/4/130476157/4783386.pdf
    • http://essencialservicos.net/uploads/1/3/0/3/130313228/9349963.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_off000067b1.bin
9325d8d7d04ba1a160d9eff309004e73917a7098697abc2ae0dae59acd1bfc41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B1 9180 bytes

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