Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a560623d5e1b59…

MALICIOUS

PDF

36.4 KB Created: 2020-03-19 08:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 121530a56185e9728f413a40f500e657 SHA-1: 2edd3499708c9472be2b99a3e35d778c2930e584 SHA-256: 24a560623d5e1b59d59cb261315a61309f3b432b93662bb2d090aa852a15960e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though partially corrupted, contains several URLs that are part of this link farm. The primary attack pattern appears to be the creation of a link farm to manipulate search engine results or to distribute further malicious content via the linked PDFs.

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://kylgbtqyouth.org/uploads/1/3/0/8/130874063/130874063.html#emco+unimat+sl+lathe+review
    • http://pathglow.com/uploads/1/3/0/4/130483396/tumobegunujokajedovi.pdf
    • http://dillettfamily.org/uploads/1/3/0/2/130270843/b6b9f.pdf
    • http://necessaryweevil.com/uploads/1/3/0/8/130814935/zifiruk.pdf
    • http://tomson-uslugibudowlane.pl/uploads/1/3/0/8/130815351/gutatugelo.pdf
    • http://mona-qatar.com/uploads/1/3/0/5/130588649/18ec575802a2.pdf
    • http://briarwoodestatesapt.com/uploads/1/3/0/4/130490786/zumiza-xasejerukiz-tudilebe.pdf
    • http://www.flowerpowernursery.com/uploads/1/3/0/5/130543569/4179928.pdf
    • http://www.radioblueadriacom.com/uploads/1/3/0/6/130604249/a0f641.pdf
    • http://www.arianabina.com/uploads/1/3/0/7/130738639/muzak.pdf
    • http://lavanderiaspadiniromacentro.com/uploads/1/3/0/5/130588778/tetidawajegon-davuwijopupaxag-bimivev.pdf
    • http://koditpaperflex.com/uploads/1/3/1/0/131070459/miteduvipopabi_pidisamafupiw.pdf
    • http://digitalvitaminagency.com/uploads/1/3/0/6/130620669/791170.pdf
    • http://nickgass.com/uploads/1/3/0/5/130551349/manilo.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_off0000670d.bin
af1e0c36cad94bd31a01e42880e518e7485889327d778edf02723eee58689124		 pdf-font-stream PDF embedded font (sfnt) at offset 0x670D 7688 bytes

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