Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76437d021b1efc5…

MALICIOUS

PDF

37.0 KB Created: 2020-03-13 04:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d2732ca74e4a3c8b93ae0570ac018423 SHA-1: c031236f06ed2392bf67e01de35beb7c3cf6441b SHA-256: b76437d021b1efc56d4d1afd00c838e1444b435d1cc12a02899b3ce64bff4956
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains a large number of external links, many of which are structured as SEO-gateway links pointing to PDF files. One prominent link in the document body, 'http://74-123-73-116.mgwnet.com/uploads/1/3/0/2/130272081/130272081.html#download+foxit+reader+3.1+full+version', is presented as a lure for downloading software. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed for malicious distribution.

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://74-123-73-116.mgwnet.com/uploads/1/3/0/2/130272081/130272081.html#download+foxit+reader+3.1+full+version
    • http://lianafaith.net/uploads/1/3/0/5/130588475/516760.pdf
    • http://myprintpad.com/uploads/1/3/0/7/130740117/1558412.pdf
    • http://www.clutchesbypat.com/uploads/1/3/0/8/130874679/zipulejojisakejiko.pdf
    • http://millymop.co.uk/uploads/1/3/0/6/130620842/9ade5.pdf
    • http://www.eddiecastle.com/uploads/1/3/0/6/130620604/giwoguwaviseta.pdf
    • http://mx.springhousegrille.com/uploads/1/3/0/9/130969899/f45a14.pdf
    • http://skinblood.com/uploads/1/3/0/4/130476740/89cc148bc0a6fec.pdf
    • http://gogetwet.com/uploads/1/3/0/4/130490151/sasusisimizusek_xugafigasiliraj_xobuturajug_nagivinol.pdf
    • http://hpcctimex.com/uploads/1/3/0/6/130604769/bc71ffd1cc.pdf
    • http://www.richardlongmd.com/uploads/1/3/0/6/130621015/wixogokusoge.pdf
    • http://mail.az-telecom.com/uploads/1/3/0/5/130551653/tetotepuk.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_off00006495.bin
3a1f5b477f55f989471e42bcfcba6ffa1761cb6767ba30a5596b6a251ae19c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6495 8364 bytes

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