Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ad7bb905890360…

MALICIOUS

PDF

49.0 KB Created: 2020-03-10 08:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3b66e78c1730299296378788df9680ab SHA-1: fef94d300dcc2317e3361476feecaa1d5d1c6a6e SHA-256: 16ad7bb905890360595469bd94948c66a17bddc0f23803dd0c26a2b969b0831a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a link farm or SEO spam, embedding a large number of external URLs. The document body, though partially corrupted, contains text related to 'nursing diagnosis for neonatal sepsis' and metadata indicating it was generated by wkhtmltopdf, suggesting a deceptive lure. The presence of numerous external links, including one pointing to an HTML file and others to PDF documents, strongly indicates an attempt to manipulate search engine results or redirect users to potentially malicious content. No scripts were extracted from this sample.

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://129.bpmtc.com/uploads/1/3/0/8/130873717/130873717.html#nursing+diagnosis+for+neonatal+sepsis
    • http://jmhudsonconsulting.com/uploads/1/3/0/7/130740018/bikugafumarikumupi.pdf
    • http://74-123-76-176.mgwnet.com/uploads/1/3/0/5/130588987/ludas-jatasafanoga-kilegerotuvuro-gogip.pdf
    • http://www.jillmen.com/uploads/1/3/0/6/130605048/8248347.pdf
    • http://autodiscover.tanheathhunt.com/uploads/1/3/0/5/130590739/derufexarave-tilemo-dumija.pdf
    • http://focusedfit.org/uploads/1/3/0/4/130488701/dosume.pdf
    • http://www.han-katedesigns.com/uploads/1/3/0/2/130272552/7625411.pdf
    • http://caddelite.ca/uploads/1/3/0/6/130604858/puxoxud_napazigozupa_wigegefobiruz_jixapex.pdf
    • http://spintosouza.com/uploads/1/3/0/2/130272631/vivosa.pdf
    • http://nestednotebooks.org/uploads/1/3/0/6/130639760/nawalalawapope.pdf
    • http://oxbowpublishing.com/uploads/1/3/0/8/130815009/milititaxete.pdf
    • http://xinlangtouzhubili.f18.ebkf.org/uploads/1/3/0/4/130488123/petidamojaponegazed.pdf
    • http://colormeribbons.com/uploads/1/3/0/6/130639896/d3f796d.pdf
    • http://www.prolifethroughmary.org/uploads/1/3/0/5/130545241/zivoxibujos.pdf
    • http://drjakejackson.com/uploads/1/3/0/7/130775034/9137455.pdf
    • http://knutekomegapeel.com/uploads/1/3/0/7/130775848/61d9d196b9cae.pdf
    • http://www.unad.agency/uploads/1/3/0/6/130604158/c35a24312e6d.pdf
    • http://willfellingham.com/uploads/1/3/0/6/130621702/wujuwazozud.pdf
    • http://www.bestukuleles.com/uploads/1/3/0/7/130738852/817629.pdf
    • http://www.activecarpentryservices.com.au/uploads/1/3/0/6/130639552/1247269.pdf
    • http://www.jadorehairboutique.com/uploads/1/3/0/6/130604465/funamalofekag_marenakavizo.pdf
    • http://muleartist.com/uploads/1/3/0/5/130539035/tiweko_wunejixigim.pdf
    • http://jcjamison.net/uploads/1/3/0/8/130814535/tuxenafutijetuw_mudomen_jazilax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d7a.bin
021ae023abddc178e26a8192d10f31c2ff0dd1b1f1f34cebd44156d6b53e09c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7A 7896 bytes
font_01_sfnt_off0000ac1f.bin
50224c6c483bfa86a10f62efd7baa2c756f8036c0a911ebd537387e21b2fb6f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1F 2732 bytes

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