Malicious PDF — malware analysis report

Static analysis result for SHA-256 c513ccb607df2dad…

MALICIOUS

PDF

51.1 KB Created: 2020-06-01 15:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37c2edca5afe1b0e3481678906d9119b SHA-1: 84fff82a883966cb69b32a4927db3a918143b820 SHA-256: c513ccb607df2dada87322e9af12808a3cd59cd3233c76e29a568dc3f7c05f0a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, a technique often used for SEO poisoning or to direct users to malicious sites. The ML classifier strongly indicated maliciousness. The primary IOC is the URL http://palladiumhotel.devsite-1.com/uploads/1/3/0/8/130814178/130814178.html#ben+thang+cuoc+audiobook, which is embedded within the document's text, suggesting a lure to a potentially malicious page.

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://palladiumhotel.devsite-1.com/uploads/1/3/0/8/130814178/130814178.html#ben+thang+cuoc+audiobook
    • http://lemontaigne.com/uploads/1/3/1/0/131070220/4503201.pdf
    • http://leadlocker.co.uk/uploads/1/3/0/9/130969703/xuwejisusewijuwed.pdf
    • http://loveyourstuffloveyourlife.ca/uploads/1/3/1/8/131859261/7041219.pdf
    • http://fiftythreestations.com/uploads/1/3/1/3/131380901/2066231.pdf
    • http://cvcommunitychurch.org/uploads/1/3/1/6/131607919/kalotixuzurogupise.pdf
    • http://openmindsholistichealingcenter.com/uploads/1/3/1/6/131636775/zelamez.pdf
    • http://blackcatdogtraining.com/uploads/1/3/1/6/131637921/2788675.pdf
    • http://oakhillcontractorsllc.net/uploads/1/3/0/3/130323968/fuforoto_pizufonoxiguk_lidoroxidavib.pdf
    • http://theembodiedexperience.com/uploads/1/3/1/6/131637365/5285914.pdf
    • http://palladiumhotel.devsite-1.com/uploads/1/3/0/8/130814178/terms.html
    • http://palladiumhotel.devsite-1.com/uploads/1/3/0/8/130814178/dmca.html
    • http://palladiumhotel.devsite-1.com/uploads/1/3/0/8/130814178/policy.html
    • http://leadlocker.co.uk/uploads/1/3/0/9/130969703/xuwejisu
    • https://bosirijexon.files.wordpress.com/2020/05/devegamisozim.pdf
    • https://juvavapu.files.wordpress.com/2020/05/junaweboresunegivox.pdf
    • https://dasawiduved.files.wordpress.com/2020/05/bedaj.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_off00008c43.bin
c794094555cea25389ce79e7be058be7edb19b0226fe99470d676c54e2291d80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C43 24556 bytes

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