Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f39fffc3128b21…

MALICIOUS

PDF

44.3 KB Created: 2020-04-06 12:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f8b318ef15ede9afdce6bc12dd9337d1 SHA-1: 689fc9a6542154e62059bde2e7c7d593c695862a SHA-256: 26f39fffc3128b21e884653f2cd2d7bda14b5a9a657a7cea0a9eb432c48bd745
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO spam operation. The document body, while partially corrupted, contains text related to 'Contabilidad general pdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

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://wheatonhills.com/uploads/1/3/0/7/130738847/130738847.html#contabilidad+general+pdf+erly+zeballos
    • http://splintersrva.com/uploads/1/3/0/8/130814584/3e4f05.pdf
    • http://creartivemedia.com/uploads/1/3/0/7/130775672/palimizisopulufijasa.pdf
    • http://rebeccafowkes.com/uploads/1/3/1/3/131379730/xamisemopona.pdf
    • http://dekastanje.nl/uploads/1/3/0/7/130774981/luxolivuwanogepirezo.pdf
    • http://hannahs-handywork.com/uploads/1/3/0/7/130739333/992568ba6b81.pdf
    • http://shufffranbusinessconsulting.com/uploads/1/3/0/4/130489152/fejopuziworedajode.pdf
    • http://politicalethnographyproject.org/uploads/1/3/0/7/130740066/kudebew_tedis.pdf
    • http://mail.backinactionchiropractic.com/uploads/1/3/0/5/130544136/678ce552379416.pdf
    • http://believe2achieve-pt.com/uploads/1/3/0/4/130483402/3977491.pdf
    • http://jeremy-tesl.com/uploads/1/3/0/7/130775722/2926432.pdf
    • http://airspaceone.com/uploads/1/3/0/3/130313458/8718020.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_off00006bb2.bin
6680816659e4d20b3c9959d1b1a3fac226ec97b7142d703ac9e1ae7036ed8ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB2 9672 bytes
font_01_sfnt_off00008e9d.bin
182ec7781ab449597ed96dd5984f47c3a7bd592fb0b38aef44939a21f095c0fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9D 16144 bytes

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