Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b38bbab6cce09e2…

MALICIOUS

PDF

39.7 KB Created: 2020-04-07 23:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6de7726cd8442ce350ae0ba861afc469 SHA-1: b558056d694938b15bf3c5e424905cbca8e6b162 SHA-256: 5b38bbab6cce09e2073ef023fb9b1dc28fc733d1a25321e5092a4767d9b03ec6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO spam campaign, likely designed to distribute malicious content or phish for credentials. The ML classifier strongly supports the malicious nature of this PDF.

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://dylanwyke.com/uploads/1/3/1/3/131379198/131379198.html#strategic+management+of+technological+innovation+melissa+schilling+free+download
    • http://panymasonline.com/uploads/1/3/0/7/130739893/dokuso.pdf
    • http://midwestskiouting.com/uploads/1/3/0/5/130588570/lewiriwitosekogib.pdf
    • http://tailgate4dogs.com/uploads/1/3/0/3/130323952/36f6a72d.pdf
    • http://sierraedgarbyu.com/uploads/1/3/0/5/130590123/23c67bc71f.pdf
    • http://propertymangementbyowner.com/uploads/1/3/0/6/130621734/fonefasod.pdf
    • http://clothesaveca.com/uploads/1/3/0/5/130589040/petomalogifafovi.pdf
    • http://claypottsbuildingservices.net/uploads/1/3/0/4/130490876/gudefizivisas_jubovijokij.pdf
    • http://yogainsite.com/uploads/1/3/0/6/130621686/517e833cb1a560.pdf
    • http://colnevalleymarquees.com/uploads/1/3/0/6/130620453/966b9114c0088.pdf
    • http://www.modernupcycle.com/uploads/1/3/0/6/130621495/wibusatoxawafa.pdf
    • http://weareepic.solutions/uploads/1/3/1/4/131482988/ac7e6996ab19d0f.pdf
    • http://wordupcafe.com/uploads/1/3/0/5/130545173/mabofizi.pdf
    • http://haphop.com/uploads/1/3/0/6/130603763/xebesujed.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_off00006fab.bin
7d3d3a5ed7e7d97b22e7872d6181190ba10ca04541c539e0cf1c1fdb55db4f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAB 8068 bytes

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