Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90b31e2c0a4bfc1…

MALICIOUS

PDF

40.4 KB Created: 2020-04-02 15:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 14dc71845cb9363ef17f286579c9892c SHA-1: c915fc2e75ec38089c28ffe4500e09f4f0ee4842 SHA-256: c90b31e2c0a4bfc1f4a602e0b10eaa0f8045c5b5eb303bc5b0621078ef7d2184
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the analysis of specific payloads.

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://mysaphi.com/uploads/1/3/1/0/131069997/131069997.html#preschool+assessment+forms+pdf
    • http://pacificcoastcollections.com/uploads/1/3/1/1/131163695/xumas.pdf
    • http://acadiantax.com/uploads/1/3/0/6/130621437/2215288.pdf
    • http://taylorgantt.com/uploads/1/3/0/8/130813710/guwazizum.pdf
    • http://thediveapp.com/uploads/1/3/0/5/130551270/36ef2.pdf
    • http://trevorlondgren.com/uploads/1/3/0/4/130475928/9c0f336b.pdf
    • http://smithfamilyautosales.com/uploads/1/3/0/4/130488371/jotivunerekoneped.pdf
    • http://evansmultiplesolutions.com/uploads/1/3/0/2/130273776/1462551.pdf
    • http://httpswwwuniquelyusboutiquesquare.com/uploads/1/3/0/4/130488839/pisuw.pdf
    • http://mmtaxandfinancial.com/uploads/1/3/0/6/130605433/jakexepome.pdf
    • http://rbilivingwell.com/uploads/1/3/1/0/131070178/xuxijosudoxoxa_jufusezeso_soseguluk_lumipamopil.pdf
    • http://watchitusa.com/uploads/1/3/0/5/130539440/50a7fbba.pdf
    • http://trifoldmaps.com/uploads/1/3/1/3/131380356/7127869.pdf
    • http://morganstudio.us/uploads/1/3/0/8/130874146/pegod.pdf
    • http://haenalee.com/uploads/1/3/0/2/130288830/bufufezirosuwak_fenid_zegavepo.pdf
    • http://become-1.com/uploads/1/3/0/6/130639054/7465497.pdf
    • http://adenta.bg/uploads/1/3/1/4/131438775/vazoxaxezojiru.pdf
    • http://rawlistings.net/uploads/1/3/1/3/131398156/2fe5451fb0.pdf
    • http://atxtitleman.net/uploads/1/3/1/3/131383416/norinek.pdf
    • http://keenkeee.com/uploads/1/3/1/4/131483235/japike.pdf
    • http://dltpiano.com/uploads/1/3/0/6/130620840/wimot.pdf
    • http://edaumarchitect.com/uploads/1/3/1/4/131407980/sanasesuwasomifis.pdf
    • http://prwk.us/uploads/1/3/0/6/130639439/pakixi.pdf
    • http://wholetheatrestudio.com/uploads/1/3/1/4/131437583/00e804e0dc1bb.pdf
    • http://highpointtradecorp.com/uploads/1/3/1/0/131069915/3428771.pdf
    • http://sportingrama.net/uploads/1/3/0/3/130379291/8e079face7.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_off00007738.bin
4cb9ebe46b40373ce8c648897c4bf02d97a30ef88371251ac3ef513928bd1c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7738 7252 bytes

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