Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3756f57df39202…

MALICIOUS

PDF

42.9 KB Created: 2020-03-11 15:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 18d09fd08d80acd63f330e3024278b6e SHA-1: 2598f32e8a522f7a6619176f83271ba0216c7eed SHA-256: aa3756f57df39202376fd36afbe919503d9ede9eee3f740a6f77e41cfbfea45d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by an ML classifier as malicious and contains a large number of external links, indicative of a link farm or SEO poisoning tactic. The primary purpose appears to be directing users to a multitude of external PDF files hosted on various domains, likely to distribute malware or engage in phishing. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific content.

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://kimresine.ca/uploads/1/3/0/7/130775389/130775389.html#radial+nerve+sensory+hand
    • http://antignosztikus.virtus.hu/uploads/1/3/0/7/130738708/defiduzawejaju.pdf
    • http://deccancatering.com/uploads/1/3/0/5/130540928/xikiwixenog-tedibijevitol.pdf
    • http://www.merchuneed.com/uploads/1/3/0/5/130544754/tidip.pdf
    • http://happyreaders.co.uk/uploads/1/3/0/5/130588822/gorobukotivex.pdf
    • http://grupozuliva.org/uploads/1/3/0/8/130874372/gezavowunamid.pdf
    • http://mail.careforfamily.com/uploads/1/3/0/7/130739538/sivunoxeganovisu.pdf
    • http://www.skylight24.com/uploads/1/3/0/6/130605516/zokovonokuba.pdf
    • http://stbfaithformation.com/uploads/1/3/0/8/130814873/tanegusimisuregisu.pdf
    • http://drlesterleemd.com/uploads/1/3/0/7/130776786/5953607.pdf
    • http://www.customerexperienceworld.co.uk/uploads/1/3/0/9/130969657/goviwozigapa_ratovolidomowu_remewolibebo.pdf
    • http://msiclick.com/uploads/1/3/0/3/130323253/pazaxebuxufagimog.pdf
    • http://www.isfuturebright.com/uploads/1/3/0/4/130483265/gosafilado.pdf
    • http://soteam.org/uploads/1/3/0/7/130739450/lonevag-retuz-kenudifugozat-laraduxajagoduk.pdf
    • http://anteako.com/uploads/1/3/0/6/130639495/8888216.pdf
    • http://mail.destinysdelightscakes.com/uploads/1/3/0/6/130621212/duwadabes-witujerawogo-mirazafovoli-zijamozuzatujo.pdf
    • http://randomlyincoherent.com/uploads/1/3/0/5/130551856/2b66b2b946b2.pdf
    • http://scottspeanuts.com/uploads/1/3/0/7/130775372/4343498.pdf
    • http://www.my-chem-is-tree.com/uploads/1/3/0/6/130621352/6ab4540e.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_off00007f08.bin
9e0c9d2d5a1abfe51328387a6e6cef74a8dad4ae4dd15b0d010fdea5e73e8040
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F08 7604 bytes