Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19a52cb0f8c3f84…

MALICIOUS

PDF

35.6 KB Created: 2020-05-23 14:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1953728ee0151cf3d0f34d760d368fac SHA-1: a3267d1b4948753639651e7a49a612610513b4db SHA-256: f19a52cb0f8c3f84f1deef4507815d6392299f7c35947e59fcbe50b67cdb06d2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing:Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of external links suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://c76vx.bpmtc.com/uploads/1/3/0/7/130775979/130775979.html#ky+100+manual
    • http://tacosdondiego.com/uploads/1/3/0/5/130539265/liguguf.pdf
    • http://fjord44.com/uploads/1/3/1/4/131483318/xemojapunukezo.pdf
    • http://lrin100.com/uploads/1/3/0/6/130620689/gajegekane-zufegetikef.pdf
    • http://samcorp.net/uploads/1/3/1/3/131379255/xuzobasuropa_zisap_fajitodof.pdf
    • http://madisongrier.com/uploads/1/3/0/6/130639277/sogenida.pdf
    • http://macgavin.com/uploads/1/3/1/6/131606546/xiriset_vidirarogizu_vadenisujon_reped.pdf
    • http://thevintagebridenj.com/uploads/1/3/1/8/131856062/1569969.pdf
    • http://dolarrodriguesborges.com/uploads/1/3/0/6/130639275/4967433.pdf
    • http://my-srg.com/uploads/1/3/1/4/131407763/xorafajavave_xomesonif_memus_dinijuzet.pdf
    • http://dallas5.org/uploads/1/3/0/5/130551618/noxofisejeke_totolaje.pdf
    • http://gambertax.com/uploads/1/3/1/4/131453086/zutofigabowesasiku.pdf
    • http://butterlovesbakingco.net/uploads/1/3/1/6/131637484/natagetabera.pdf
    • http://eastlondonboy.com/uploads/1/3/0/7/130775905/753605d.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_off00005d99.bin
16a88558901225ddbf294fa7f7b194ff09f7fcf9e6031add0870a512abb51466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D99 12056 bytes

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