Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80d1256addb1960…

MALICIOUS

PDF

28.9 KB Created: 2020-04-05 08:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2afbbabf5bbd84394a2b8dd67a056bf8 SHA-1: 00764a2af1c62be95b064762e7ad6eec4da6f63c SHA-256: f80d1256addb1960cd804112d33cc98c0d8097990c737ab97d670b0a10466d4c
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to creating online concept maps, but its primary function appears to be a link farm. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, with the dominant host being 'bebenbelle.com'. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of external links suggests a distribution or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kitab4all.com/uploads/1/3/0/6/130604449/130604449.html#como+hacer+un+mapa+conceptual+en+linea+gratis
    • http://bebenbelle.com/uploads/1/3/0/7/130739039/dapefavufajil-retaxevego-gopot.pdf
    • http://faninmotion.com/uploads/1/3/0/3/130313376/e72a8a.pdf
    • http://ug-mmovn.com/uploads/1/3/0/7/130776421/kuzeladalek.pdf
    • http://www.flyyogastudio.com/uploads/1/3/0/2/130272070/8134926.pdf
    • http://katewhyte.ca/uploads/1/3/0/2/130289185/6849472.pdf
    • http://miraclecreations.shop/uploads/1/3/0/7/130776068/miguwu.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_off0000498f.bin
daf18bb7af80c187e9ff53863c937832bab9c37d1c6596f6aa060694d42dd724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x498F 7308 bytes

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