Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6f458979db4b20…

MALICIOUS

PDF

35.3 KB Created: 2020-04-19 10:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2e25fcb8db728d5fd87ec5b535a22983 SHA-1: 93ff8eaea0794938f3a2c0989c193d36f2d619ca SHA-256: 7d6f458979db4b20aeeafc981e422fb869745c8396affb97fbbeda52ff563ed3
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to seemingly unrelated content, indicating a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests a drive-by download or phishing attempt. No scripts were extracted, but the structure and heuristics point to a malicious intent to redirect users to potentially harmful content.

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://tracieward.com/uploads/1/3/0/6/130639744/130639744.html#technical+evaluation+criteria+template+excel
    • http://jfongsg.com/uploads/1/3/1/0/131070983/3126570.pdf
    • http://makenziepaulk.com/uploads/1/3/1/4/131483069/pimapifoda_tulupat_fawudikowike.pdf
    • http://blgservices.net/uploads/1/3/0/5/130540461/3309419.pdf
    • http://573chili.com/uploads/1/3/1/4/131437079/5301537.pdf
    • http://bodyessencesf.com/uploads/1/3/0/5/130550756/tubafolifi.pdf
    • http://echelondt.com/uploads/1/3/0/5/130589412/mebalifufo.pdf
    • http://margaretwhitten.com/uploads/1/3/0/5/130551630/julakukubi.pdf
    • http://stanneandallsaints.org/uploads/1/3/0/5/130551081/5e38216b10defa.pdf
    • http://usu-retona.site/uploads/1/3/1/4/131453924/2380870.pdf
    • http://stanneandallsaints.org/uploads/1/3/0/5/130551081/5e38216b1
    • 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_off000061dc.bin
55017c70da457320489bf0b094b295d410e80cc3cfd200ffe41f8f2c2ad2167f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DC 8128 bytes

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