Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb9683fea868e62…

MALICIOUS

PDF

37.7 KB Created: 2020-03-21 12:11:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db5314668f7039b572ad9d3cc628eab2 SHA-1: 002ee7f754c9fa3323a6893a2547d8ddd88556d4 SHA-256: 7cb9683fea868e62a9f3a17672f6d36271d2dddf7aa11affb517a645a883cbaa
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on different domains. This technique is often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, and the presence of numerous unknown-reputation URLs supports this assessment.

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://jessicamcvay.com/uploads/1/3/0/4/130476632/130476632.html#netgear+n600+wndr3400v2+firmware
    • http://livegirlreview.com/uploads/1/3/0/8/130814070/7715459.pdf
    • http://internationallysuave.com/uploads/1/3/0/3/130379517/gumeg.pdf
    • http://cookielovecustomsugarcookies.com/uploads/1/3/0/5/130546457/fusovivo.pdf
    • http://sshvug.com/uploads/1/3/0/2/130288626/f3dd2655.pdf
    • http://webdisk.lldmshakopee.org/uploads/1/3/0/2/130272084/4c7259d79.pdf
    • http://joshua-linder.com/uploads/1/3/0/6/130604467/2e5c55f7160b6.pdf
    • http://chevallierfamily.org/uploads/1/3/0/4/130489275/fexukafudekenuzawaz.pdf
    • http://www.whimsicalwinsomes.com/uploads/1/3/0/5/130539287/wozitijifutajax_fadilizovojop.pdf
    • http://thedevilsmusic.co.uk/uploads/1/3/0/2/130270936/2494660.pdf
    • http://noraleefashion.com/uploads/1/3/0/5/130543600/4210935.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_off000067f8.bin
d87a8a5faef3c4bf61ec86f461b96322f49592997e61dec9cb72aaa035e3d37f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F8 8396 bytes

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