Malicious PDF — malware analysis report

Static analysis result for SHA-256 722383d30df7fb72…

MALICIOUS

PDF

37.4 KB Created: 2020-06-17 06:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5109b1990e0637642f7314ed030cc358 SHA-1: 03d2afa45244a12214a481c60d13a127222b522e SHA-256: 722383d30df7fb72e6074fbac6164c853a6dc1079db6921cf4c4a5f5c5024c82
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This suggests a link farm or SEO manipulation tactic, likely intended to drive traffic or host further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URLs supports a malicious intent.

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://mta-sts.dxawards.com/uploads/1/3/1/3/131398252/131398252.html#covert+pdf+to+jpeg
    • http://cejaccounts.co.uk/uploads/1/3/0/2/130289296/1107980.pdf
    • http://mail.encuentro.social/uploads/1/3/0/8/130874269/burerisoninudawis.pdf
    • http://ogc.devsite-1.com/uploads/1/3/1/6/131637658/9381738.pdf
    • http://vanyagholistictherapy.com/uploads/1/3/0/2/130272332/pekusexawufonux.pdf
    • http://thequickenloanspartnership.com/uploads/1/3/1/8/131856584/wovatobali-lesipebit-kunoraveduliwut-riveluvozu.pdf
    • http://patriot-mech.com/uploads/1/3/1/4/131407565/dupukeparopozozizir.pdf
    • http://yourtalentmentor.com/uploads/1/3/0/7/130740627/tajojabu-rapoxo-pemez-zisutakateku.pdf
    • http://webmail.michaelparishchurch.com/uploads/1/3/0/6/130605339/7502234.pdf
    • http://jrobsessions.com/uploads/1/3/0/7/130738542/ef9c3e5fdd5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056ca.bin
43be894e3142613ae362812d913eb43ceb92fff1c62c9fd7ff130f47301d288d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56CA 4580 bytes
font_01_sfnt_off0000668f.bin
db3ea64d4df5d100118b01e8a99bd4da5519c184e97b5112097019af3223282a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668F 10388 bytes

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