Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ab45f56451c7a7…

MALICIOUS

PDF

35.0 KB Created: 2020-04-25 06:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f44b364d94cf94b806c128a92b8ec3fc SHA-1: 3367c17fea28b43ccedeba8a0141b5e6ca853677 SHA-256: f9ab45f56451c7a7210257d6db2ec0271e7eea592e9fc160f5cf542c7d2f0536
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains. This behavior is indicative of a link farm or a method to distribute malicious content through seemingly innocuous documents. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://is-tbc.info/uploads/1/3/1/6/131637656/131637656.html#chevening+application+template
    • http://airtermia.net/uploads/1/3/0/6/130621649/d15a5d.pdf
    • http://beyondthedeskleadership.com/uploads/1/3/0/4/130435571/rigelu.pdf
    • http://chrismendez.net/uploads/1/3/0/7/130775284/vafadeselex_nuxasosigakix_tumifopufawup_zogoderi.pdf
    • http://gfihomeinspections.com/uploads/1/3/1/4/131438310/daralunufofabi_noxakobesiropa_maweterodari_lesed.pdf
    • http://yanahgroup.com/uploads/1/3/1/4/131453536/9b8deb1d.pdf
    • http://aldoggettmaine.com/uploads/1/3/0/4/130476272/xebewedezuzawo_wanipipugixeva_bosokonivimuf.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_off00006229.bin
a2b4028ecb9dbdad263ad36e678a7f30db80c830aa7a7b2967ddfeaf99ff3eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6229 7828 bytes

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