Malicious PDF — malware analysis report

Static analysis result for SHA-256 b587794888157174…

MALICIOUS

PDF

50.6 KB Created: 2020-03-29 13:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 00e09cfa833fa873c8641e30adffb0a6 SHA-1: 52bc57e104c7c2f11e540ec021ee1038d827ed80 SHA-256: b587794888157174aa33970d4e98c09931b5c3408bf520ee9b077517770ef2c0
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, many pointing to similarly structured URLs on different domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The primary URL points to a page with a title related to Roman numerals, but the content is heavily obfuscated and likely serves as a lure to the linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://adsl-63-204-18-59.benefitplans.org/uploads/1/3/0/7/130739366/130739366.html#los+numeros+del+1+al+50+en+romanos
    • http://thespeechshop.com/uploads/1/3/0/6/130604537/mezikofetofofibojana.pdf
    • http://cancerhousing.com/uploads/1/3/0/8/130815093/6e50a2d6.pdf
    • http://wellnessfromhouse.info/uploads/1/3/0/7/130739845/f64d1ef1d178.pdf
    • http://loveyouemanate.com/uploads/1/3/1/4/131438397/fipodow-lalomujefip-pofuxoxa.pdf
    • http://teachersbookbaggraphicsandresources.com/uploads/1/3/0/8/130874381/3eba4bf9c40550f.pdf
    • http://euvat.services/uploads/1/3/0/6/130604703/c4421bde2480.pdf
    • http://voxtw.com/uploads/1/3/0/6/130604126/27d177e172.pdf
    • http://voimanlahteella.com/uploads/1/3/0/6/130639678/wiwuporoduvumumasit.pdf
    • http://timyang.com/uploads/1/3/0/5/130544811/8238371.pdf
    • http://greatlakescommitmentnight.com/uploads/1/3/0/4/130435722/a4d541a.pdf
    • http://lacannabischef.com/uploads/1/3/0/3/130312912/4282729.pdf
    • http://equippat.com/uploads/1/3/0/5/130540504/letaz.pdf
    • http://toddbensoninsure.com/uploads/1/3/0/7/130775528/b0205737.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_off00009cec.bin
c9631bd32dff06cae16c342950028796bfaacb124b77e9cb0ec7e93aa379f216		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CEC 8268 bytes

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