Malicious PDF — malware analysis report

Static analysis result for SHA-256 071bc48d4a46621b…

MALICIOUS

PDF

36.6 KB Created: 2020-05-21 01:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: becc1cf980e16f46b84b41c40f11a4fd SHA-1: 073bf82cff69ad31f1f84efed0e67679183c0296 SHA-256: 071bc48d4a46621b1ac6c3dba6cb6055fb280f10bfd3b7f31aba0eb486a44f90
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated but appears to contain references to the URLs. The primary attack pattern involves directing users to a multitude of external websites, likely for SEO spam or to host further malicious 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://southalabamalabradors.org/uploads/1/3/1/4/131483019/131483019.html#ib+french+paper+2
    • http://veronkaoskar.com/uploads/1/3/1/4/131407547/2476c7d6fbbb9d.pdf
    • http://ocalacandystore.com/uploads/1/3/0/4/130489564/fexobero_jezewiwuwum.pdf
    • http://guyellisphotography.com/uploads/1/3/0/6/130620684/8430509.pdf
    • http://garagedoorrepairelsegundo-ca.com/uploads/1/3/0/8/130814007/lefezemin.pdf
    • http://dtzsites.com/uploads/1/3/0/7/130740349/konojip.pdf
    • http://lestaillesfortes.com/uploads/1/3/0/7/130738684/2856301.pdf
    • http://allamericanhousesitters.com/uploads/1/3/1/6/131607635/b412dd8d2465cdb.pdf
    • http://covangroupllc.com/uploads/1/3/0/8/130813526/1019085.pdf
    • http://lauraholmanbyrne.com/uploads/1/3/0/2/130272859/57e530c09b1.pdf
    • http://tothewhistleltd.com/uploads/1/3/0/6/130621450/55ecfd9d52db.pdf
    • http://lorrainemonteagut.com/uploads/1/3/1/8/131856907/zudinakenesu-lutapu-redomaxelivo.pdf
    • http://twosquaretax.com/uploads/1/3/0/5/130551164/7360260.pdf
    • http://stephurfoodgameup.com/uploads/1/3/0/3/130379427/xusetabonarek_seromanas_vixezen.pdf
    • http://naumu.family/uploads/1/3/0/8/130874218/rebuzunutatide.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006224.bin
f3126c8072fb8acea92a3b3a058f85f9d6fa07bda45e582c34f87c1bb5bb9dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6224 11100 bytes

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