Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8880bdbf882e5a…

MALICIOUS

PDF

37.9 KB Created: 2020-04-03 07:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ee947580a8f77f6b37105a516125f9d9 SHA-1: 4ce7ca70e118667523a347268deeffa368ec7f2d SHA-256: 6d8880bdbf882e5a878bcd2757347085db45b45add8c36d2e308a33399d4a294
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the primary attack pattern involves directing users to external resources.

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://tomleevideos.com/uploads/1/3/0/9/130969685/130969685.html#ejemplos+de+trabajos+de+investigacion+con+hipotesis
    • http://oldnumberone.com/uploads/1/3/0/6/130605156/kuxadefoluwapifikur.pdf
    • http://backshops.host/uploads/1/3/0/3/130324192/730008.pdf
    • http://2dayflowers.net/uploads/1/3/1/4/131453250/7520858.pdf
    • http://onepoint-lifebuilding.com/uploads/1/3/0/9/130968996/8bb14bbd85cd86.pdf
    • http://colombe.org/uploads/1/3/1/3/131379193/muzikolut.pdf
    • http://macrowsoft.com/uploads/1/3/1/0/131070230/1551305.pdf
    • http://drivingcommunication.com/uploads/1/3/1/3/131380295/puvorug-piwigukuvuwox-pebukuf.pdf
    • http://financementgeneral.com/uploads/1/3/0/8/130874289/goxigapugugazas.pdf
    • http://lawyerturnedgypsy.com/uploads/1/3/0/8/130814017/6450664.pdf
    • http://amyfantalis.com/uploads/1/3/0/6/130621664/2236860.pdf
    • http://anebike.com/uploads/1/3/0/7/130738661/putitoxi-wabagigizizota.pdf
    • http://possibilitycourse.org/uploads/1/3/1/1/131163610/e5151.pdf
    • http://doctorbpics.com/uploads/1/3/1/0/131070872/d552580.pdf
    • http://mineacquisitiongroup.com/uploads/1/3/1/4/131454265/tarijel.pdf
    • http://aipatents.net/uploads/1/3/0/4/130491079/c0d8fbed.pdf
    • http://houseprosnow.net/uploads/1/3/0/6/130621024/9c005af3ab.pdf
    • http://steppingstonesforwellness.com/uploads/1/3/0/8/130814258/4e4e648.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_off00006b42.bin
cdea7db09962db804dd542b8a83d01ccd4d894e0d9ed7e8ebec707209885199c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B42 7848 bytes

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