Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9770fd3b4fa517d…

MALICIOUS

PDF

31.8 KB Created: 2020-04-17 05:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2056250b774cd35be1689346124620bc SHA-1: 0214994a178eb16241b714cdea39584e4db6703a SHA-256: b9770fd3b4fa517d30a2985ff0f58df384557b20e0051e46d9485e1fec5b4a69
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDFs hosted on various domains, a technique commonly used for SEO poisoning or redirecting users to malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'Shingles vaccine guidelines 2019', likely a lure to attract unsuspecting users.

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://empoweringcommunityhope.com/uploads/1/3/1/3/131379290/131379290.html#shingles+vaccine+guidelines+2019
    • http://wolverine-restoration.com/uploads/1/3/1/4/131453154/669007832e33b.pdf
    • http://youngathletesports.physio/uploads/1/3/1/4/131482850/a95a4bdf0d9bd4f.pdf
    • http://cdradministrativeservices.com/uploads/1/3/0/7/130738823/nekeparu_toxosotareteg_dujax.pdf
    • http://zozen.ca/uploads/1/3/0/2/130271090/b7d158df3.pdf
    • http://599-bonus.site/uploads/1/3/1/3/131383264/7450035.pdf
    • http://findingabilityinlearningdisability.com/uploads/1/3/0/5/130588509/7133728.pdf
    • http://justaddmagictravel.net/uploads/1/3/1/3/131379536/7771866.pdf
    • http://magicwords.dk/uploads/1/3/0/4/130436130/7677390.pdf
    • http://turningheadsdesign.com/uploads/1/3/0/2/130289225/717513.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_off00005707.bin
54762549bcdf8d5f1911bbaf7097e74cbec0a560dfbfc05c7b0ce80f6cb45b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5707 7156 bytes

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