Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e77c977b869f91…

MALICIOUS

PDF

50.5 KB Created: 2020-06-04 01:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f34617e32a78a139ea424a4483718e3b SHA-1: a154a7740c41ac8db0615a3645e91715b8254cea SHA-256: 74e77c977b869f918e07f5f6bc6cc8b98b297638e4e5e56a310613fedf5bfb73
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary lure appears to be related to a 'Legally Blonde book', as indicated in the document body and URL fragments. The ML classifier strongly flagged this PDF as malicious. The presence of numerous SEO-linked PDFs suggests a link farm or content redirection scheme, likely intended to drive traffic or 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://barkingmaddogwalking.com/uploads/1/3/0/9/130969415/130969415.html#legally+blonde+book
    • http://genesisroofingco.com/uploads/1/3/0/8/130873958/e926b.pdf
    • http://sewgr8fulbygyh.com/uploads/1/3/0/7/130776220/gojamix_kazixofuv.pdf
    • http://learnwisdom.net/uploads/1/3/0/6/130603841/7081eed.pdf
    • http://vamatabeauty.com/uploads/1/3/0/3/130379167/afea87abdd0.pdf
    • http://manhbtc.com/uploads/1/3/0/7/130738572/nanefolixiwerero.pdf
    • http://changcheowteckcom.com/uploads/1/3/0/9/130969618/9990250.pdf
    • http://mymlmbiz.com/uploads/1/3/1/6/131606511/gebarutat.pdf
    • http://buytheweather.com/uploads/1/3/0/2/130271047/f21ab4.pdf
    • http://barkingmaddogwalking.com/uploads/1/3/0/9/130969415/terms.html
    • http://barkingmaddogwalking.com/uploads/1/3/0/9/130969415/dmca.html
    • http://barkingmaddogwalking.com/uploads/1/3/0/9/130969415/policy.html
    • https://noperev421604146.files.wordpress.com/2020/06/domuwojiniloz.pdf
    • https://botemep98974298.files.wordpress.com/2020/06/9789025019.pdf
    • https://rajubap.files.wordpress.com/2020/06/kijuzoxeni.pdf
    • https://xujugolokaz.files.wordpress.com/2020/06/bobewatuxosave.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_off00009a61.bin
44bbd9a9791d6a1cba5da866bff2a9c0790975abb4595343d1cca0033044bb29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A61 10992 bytes

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