Malicious PDF — malware analysis report

Static analysis result for SHA-256 152a13b02ca1d27b…

MALICIOUS

PDF

42.3 KB Created: 2020-04-22 05:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fcaa7242a01bea2df28db9ad437b5aba SHA-1: 4154e00a2a7aa39715245bd7ce19cfd208819b42 SHA-256: 152a13b02ca1d27b89d22d3fb708dd7c2dab94bae0019c31766c4f0454922f5e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to a network of websites, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://consciousrealignment.com/uploads/1/3/0/7/130776607/130776607.html#cyclopentane+chair+conformation
    • http://quiltingearthmama.com/uploads/1/3/0/6/130621524/xexadagivoxexubam.pdf
    • http://centralbookkeeping.com/uploads/1/3/0/8/130814112/edaff67d2a570e.pdf
    • http://chrisbrooksdesign.com/uploads/1/3/0/7/130739022/25812edb1620340.pdf
    • http://purelinewellness.com/uploads/1/3/0/4/130476410/889065.pdf
    • http://transatlanticwoundcare.com/uploads/1/3/0/6/130621024/ca4c1272b4e91.pdf
    • http://triciazoellerauthor.com/uploads/1/3/0/4/130488696/1437495.pdf
    • http://stsmineral.com/uploads/1/3/0/9/130969182/7117328.pdf
    • http://mlshomeinspections.net/uploads/1/3/0/2/130291544/mawetuzademenat.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007449.bin
c8566b42edef5727a625e8eaa5fb3e12fba4c95930a6613b3d809ee7e0186e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7449 8624 bytes
font_01_sfnt_off0000944c.bin
8b292db283a0ef49a4a24478c14192a15b25ce9841f4f7b0b0b6b6b294ab5ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x944C 2684 bytes

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