Malicious PDF — malware analysis report

Static analysis result for SHA-256 457ebbc297354cab…

MALICIOUS

PDF

36.6 KB Created: 2020-03-29 14:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4afe27dccd72fe47a1c2adb16a48349 SHA-1: 3cb9444234c89abd81fd9caba293c075d6a5bf11 SHA-256: 457ebbc297354cab43a2041685ab8d87cc17733bade5bc56f2cc1ac7c259e93c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary link points to a page titled 'Fichas de lectura para 4o de primaria', suggesting a lure for educational content. The ML classifier strongly flagged this PDF as malicious. The numerous links hosted on domains like socialvaultgroup.com and colddiamnd.com indicate a coordinated effort to distribute content, likely malicious, across multiple sites.

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://colddiamnd.com/uploads/1/3/0/8/130814576/130814576.html#fichas+de+lectura+para+4o+de+primaria
    • http://socialvaultgroup.com/uploads/1/3/0/5/130539934/4861386.pdf
    • http://alvtrek.com/uploads/1/3/0/7/130738755/4748271.pdf
    • http://newfoodie.net/uploads/1/3/0/6/130604240/namijabawuw.pdf
    • http://www.thecambridgeparentcoach.com/uploads/1/3/0/8/130874381/5787921.pdf
    • http://kimpex.org/uploads/1/3/0/4/130483146/jizabuv.pdf
    • http://nowwhatarizona.com/uploads/1/3/0/6/130604516/tolab-bodema-gugagituvogi.pdf
    • http://jayelando.com/uploads/1/3/0/5/130588415/fuzaxipavet.pdf
    • http://suziehumphreys.com/uploads/1/3/0/2/130288893/luzuzozepubogi_kubigi.pdf
    • http://lab215spitta.net/uploads/1/3/1/4/131409442/zedukawexawi.pdf
    • http://herestotravel.com/uploads/1/3/0/6/130621758/6b812f68.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_off00006543.bin
965ed0ce9a321abc8b567643f186a69bf59d7df6c44cc92b9c2e4c27db420511		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6543 8508 bytes

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