Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff9121ce8f64ea7…

MALICIOUS

PDF

28.2 KB Created: 2020-04-20 21:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2d64efefed3f2270cb89190af992c33c SHA-1: 079f1faaf7209226a247480dc6ea91dcc12a0f26 SHA-256: 8ff9121ce8f64ea7fd30090e501cfce9682800680e6bae2a9d55190f5fb29f6d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, a technique often used for SEO spam or to direct users to malicious sites. The document body, though partially corrupted, suggests a lure related to 'in text citation practice worksheet answers'. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://sangnsavage.vip/uploads/1/3/0/7/130776371/130776371.html#in+text+citation+practice+worksheet+answers
    • http://razzledesigns.com/uploads/1/3/0/7/130775604/juzogaxikota_xefuride.pdf
    • http://dejavubasketball.org/uploads/1/3/1/3/131398022/sujuxa-ridiwafewixox-xoretipik-jakazopawutozuj.pdf
    • http://hautebohomexico.com/uploads/1/3/1/3/131378988/9e7f1.pdf
    • http://the-inla.ca/uploads/1/3/0/2/130271076/5ca3e1.pdf
    • http://medicinaintegrativavalladolid.com/uploads/1/3/0/6/130620778/lapawitarutamibej.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_off000045c2.bin
5d114de6e42994c275871121398c6fbf019355c02220c3e4efb31f6d11cd3d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45C2 7840 bytes

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