Malicious PDF — malware analysis report

Static analysis result for SHA-256 180a23cb4cf3f4ef…

MALICIOUS

PDF

39.3 KB Created: 2020-03-25 01:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed7d093d223b98529715293bb99e49c8 SHA-1: 328061e6ad8af9e218ee56f806665e7432d488c7 SHA-256: 180a23cb4cf3f4ef2bcc33d0276d233a398d9cdcf081e01f4aed55ddee5601d5
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, characteristic of a link farm designed to manipulate search engine rankings. The embedded links, such as http://witherlysgreenhouse.com/uploads/1/3/0/6/130621187/130621187.html#concerning+hobbits+violin+tutorial, point to various PDF files hosted on unrelated domains, suggesting a coordinated effort to drive traffic. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm attack.

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://witherlysgreenhouse.com/uploads/1/3/0/6/130621187/130621187.html#concerning+hobbits+violin+tutorial
    • http://malmorentalhouse.org/uploads/1/3/0/2/130287953/nakufa_xukezu_jezesafuvu.pdf
    • http://northernnerd.com/uploads/1/3/0/7/130775862/15a2e9f.pdf
    • http://quitatlast.com/uploads/1/3/0/4/130478566/4a7be9be04872.pdf
    • http://virginiawinegypsy.net/uploads/1/3/0/5/130588559/901db.pdf
    • http://newtoninvestmentsllc.net/uploads/1/3/0/9/130969238/vapagutubaj-puwum-foxuwiz.pdf
    • http://www.creatingviriditas.com/uploads/1/3/0/7/130775820/1597755.pdf
    • http://nasapins.com/uploads/1/3/0/4/130483412/7649517.pdf
    • http://pacificpsm.com/uploads/1/3/0/6/130605222/jovug-mufunopabopake-jofexixedole.pdf
    • http://gotheatrefest.org/uploads/1/3/0/4/130488891/davoko.pdf
    • http://zimpresos.com/uploads/1/3/0/6/130604940/d554990.pdf
    • http://mountainsportandfitness.com/uploads/1/3/0/2/130289259/rapefen.pdf
    • http://eyelashesandmorebyerin.com/uploads/1/3/1/1/131163559/9658766.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_off00006b7d.bin
162a2b6d7bd1927123ab403f31b37f47a2edf1f6185e131fc075175c77c4be39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7D 9360 bytes

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