Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5f2b97d2e37d10…

MALICIOUS

PDF

38.6 KB Created: 2020-03-29 05:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e12eda743ec6ce693b7f2981af8d2ee0 SHA-1: 74c53cd90fde13aa115e457d9631c9f5b11e4af8 SHA-256: 1d5f2b97d2e37d1046fe9c9bac1f2184ef51d0d25bd237b1edf7f49ca7d7d6a8
96 Risk Score

Malware Insights

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

The PDF document contains a lure related to Christmas coloring pages, but its primary function is to redirect users to a large number of external PDF files hosted on various domains. This behavior is indicative of a link farm or a redirection mechanism designed to lead users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://host37.carmichaelnl.com/uploads/1/3/0/3/130323113/130323113.html#adornos+de+navidad+dibujos+navide%C3%B1os+para+colorear
    • http://srguniversity.com/uploads/1/3/0/7/130775249/9b5c6e52de.pdf
    • http://ns.stonehouseinn.net/uploads/1/3/0/6/130639412/4405663.pdf
    • http://learntricks.net/uploads/1/3/0/5/130551756/8617711.pdf
    • http://msgray.org/uploads/1/3/0/6/130620431/pumowu.pdf
    • http://irvinelaserhair.com/uploads/1/3/0/4/130476339/2722683.pdf
    • http://executivetaxsolutions.net/uploads/1/3/0/5/130545199/xirubajumo-rexunopudoj-somamuzini.pdf
    • http://southernspasandbilliards.com/uploads/1/3/0/3/130323510/nojuzadosaxenej_wojez.pdf
    • http://horncomb.com/uploads/1/3/0/5/130590661/tabaset_tomeropo_tizerelexaji_lubaz.pdf
    • http://mjmch.com/uploads/1/3/0/5/130539944/3131290.pdf
    • http://fightspeedcameraticket.com/uploads/1/3/0/2/130289561/xirapete.pdf
    • http://detroitfitclub.com/uploads/1/3/0/6/130620366/3e588cbb.pdf
    • http://ongiarafoundation.com/uploads/1/3/1/3/131398380/8396916.pdf
    • http://airpoirtautoelectrics.com/uploads/1/3/0/7/130739472/4883867.pdf
    • http://lawscustomcncrouting.com/uploads/1/3/0/6/130620551/2830c4304.pdf
    • http://villannabella.com/uploads/1/3/0/6/130604264/ad74c2.pdf
    • http://dsmithpastels.com/uploads/1/3/0/4/130435577/labovun.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_off00006a6e.bin
58fc2058458cbf838695e564264201ff8081cf20c7c90d9026359948011cd7ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6E 8772 bytes

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