Malicious PDF — malware analysis report

Static analysis result for SHA-256 724b0ce4748eec90…

MALICIOUS

PDF

38.0 KB Created: 2020-03-16 01:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fe1cafde87e65a88744886d94411286a SHA-1: 3533ba91009f034aa89c8b65a571a74da985ef74 SHA-256: 724b0ce4748eec90fd90b9cdfbe9494e820e3571b5e88f122cc2dbc6f87efca1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs pointing to external PDF files, indicative of a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious, and the presence of external links suggests an attempt to redirect the user to potentially harmful content. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or credential harvesting attempt.

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://webdisk.digcitinstitute.com/uploads/1/3/0/8/130813095/130813095.html#phishme+reporter+has+fired+an+exception
    • http://studiomcliz.com/uploads/1/3/0/4/130478975/6009927.pdf
    • http://lindzeypaysenblog.com/uploads/1/3/0/2/130272421/murimogufesol.pdf
    • http://thlglobal.net/uploads/1/3/0/5/130544889/3edfb95db456.pdf
    • http://sumterculture.org/uploads/1/3/0/2/130287847/gamilazunupaw.pdf
    • http://montalvinmanor.org/uploads/1/3/0/5/130538817/9509777.pdf
    • http://thedragonflycatalyst.com/uploads/1/3/0/5/130590058/2433522.pdf
    • http://scsiptyltd.com/uploads/1/3/0/7/130775649/152d8787d26.pdf
    • http://unrealin.com/uploads/1/3/0/3/130379065/942a44.pdf
    • http://www.delaneyparsons.com/uploads/1/3/0/4/130436521/a908069614e.pdf
    • http://www.lapalli.ch/uploads/1/3/0/5/130589374/9580545.pdf
    • http://pomajo.com/uploads/1/3/0/4/130483801/8ecb1d3fb8bb0.pdf
    • http://creativemindsa2z.shop/uploads/1/3/0/6/130620265/9688521.pdf
    • http://msexcelplus.com/uploads/1/3/0/6/130620783/e08a4188d.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_off00006a79.bin
ce202816a63e895764c39ebeaf7dd1f622fc4c3101a8b63b3644da87b8ca1066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A79 8468 bytes

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