Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4f3de414c894cb…

MALICIOUS

PDF

35.4 KB Created: 2020-06-05 00:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c009db7f4b85190a2b625f7e79cc9ba1 SHA-1: bfd9dc66d00dfd383c37993bf83b9a1ea51bd158 SHA-256: db4f3de414c894cb59a8c955ce4ac0a893afd9eb4ba1df691072ce217a39b33a
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted from this sample, but the extensive linking pattern is sufficient to infer a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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
  • 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://fbfitness.no/uploads/1/3/0/6/130604231/130604231.html#homeready+framework+homeownership+qu
    • http://blatherscatdesign.com/uploads/1/3/1/4/131438071/dujeso.pdf
    • http://corevolutionart.com/uploads/1/3/0/5/130538922/55b82f060.pdf
    • http://linzlia.com/uploads/1/3/0/8/130815277/tipevabab.pdf
    • http://jupiterlevel.com/uploads/1/3/0/5/130589057/kemenagov.pdf
    • http://kasnia.org/uploads/1/3/0/3/130323697/6658768.pdf
    • http://74-123-77-169.mgwnet.com/uploads/1/3/0/3/130323616/768c183fd3b.pdf
    • http://yogawithlb.org/uploads/1/3/0/7/130739856/39293a2f102.pdf
    • http://mamaglows.com/uploads/1/3/0/6/130640214/tulotipinemebakogusa.pdf
    • http://steps-ahead-dance.com/uploads/1/3/0/5/130550774/aa86e7.pdf
    • http://fbfitness.no/uploads/1/3/0/6/130604231/terms.html
    • http://fbfitness.no/uploads/1/3/0/6/130604231/dmca.html
    • http://fbfitness.no/uploads/1/3/0/6/130604231/policy.html
    • https://jisezos.files.wordpress.com/2020/06/kagelerixefogetojad.pdf
    • https://wolodexizip.files.wordpress.com/2020/06/50179588462.pdf
    • https://finuroni.files.wordpress.com/2020/06/gukemevopuk.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_off00005d92.bin
86ff491e83123eb3fbeab8e627b018bcffa0972bec833cee41c25c6eddd49094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D92 11012 bytes

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