Malicious PDF — malware analysis report

Static analysis result for SHA-256 31819c7fd8db4bb2…

MALICIOUS

PDF

31.8 KB Created: 2020-03-21 13:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e122c3981b31ea10b2f76660b415037f SHA-1: 9598d04e0643af61ca79f335ef75a70a049c9226 SHA-256: 31819c7fd8db4bb26fc8aa6ebc13e5890b5ff1504c2f238db95f07dd10ea80c6
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted across numerous domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://meeteechildrenassistanceprogram.com/uploads/1/3/0/6/130639077/130639077.html#ciencias+1+biologia+francisco+tavizon+pdf
    • http://uberkrafts.co/uploads/1/3/1/0/131070148/toguwedan.pdf
    • http://northcountypawscause.org/uploads/1/3/0/5/130588695/rejefor-kupezoduwem-pukesi.pdf
    • http://forcevolleyball.org/uploads/1/3/0/8/130874307/2512dd9598cb8c3.pdf
    • http://blacktentcreative.com/uploads/1/3/0/5/130540010/kuwokifikuzur_suweda.pdf
    • http://peggyleavitt.com/uploads/1/3/0/7/130739221/buburerakixeraguf.pdf
    • http://www.jdwright.ca/uploads/1/3/0/4/130488884/ninifojenigig.pdf
    • http://knotyourthoughts.site/uploads/1/3/0/4/130483844/319eeb8e.pdf
    • http://actondentalcare.com/uploads/1/3/0/8/130814168/jilowe.pdf
    • http://cielocopy.com/uploads/1/3/0/8/130874307/6141299.pdf
    • http://www.systemicnlp.nl/uploads/1/3/0/7/130740616/9727499.pdf
    • http://hostmaster.bvisualapparel.com/uploads/1/3/0/4/130475909/075a68c36.pdf
    • http://headonltd.com/uploads/1/3/0/9/130969586/kubebopij.pdf
    • http://phase2concerts.com/uploads/1/3/0/6/130604701/tinapi.pdf
    • http://www.calpolymca.com/uploads/1/3/0/5/130543070/kexivojelituzib.pdf
    • http://communicatenm.com/uploads/1/3/0/2/130273738/zofabesi_notinof_wuvimumekemit.pdf
    • http://skintherapystudioleesburg.com/uploads/1/3/0/5/130542912/xamoviw.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_off00005582.bin
503eeb63da9e1d4ba1fd90a6fa3c564da2d4e0503c195cae27ddca5b4c262611		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5582 7608 bytes

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