Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e10a903a579d428…

MALICIOUS

PDF

55.7 KB Created: 2020-03-30 13:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e399f3f8a677599b126b625d7b950c75 SHA-1: 33f2012b2f9b9d8763fe648f4a5e82980f5a26b6 SHA-256: 9e10a903a579d4283c90028e85f6e79b44f72396b9bc6166d65f52606b5c739c
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This pattern is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. The embedded URLs suggest a redirection or download mechanism, though no specific payload execution was directly observed in the static analysis.

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://74-123-77-252.mgwnet.com/uploads/1/3/0/6/130639411/130639411.html#que+es+el+modelo+pedag%C3%B3gico+constructivista
    • http://martin-johansson.com/uploads/1/3/1/4/131438510/fivofefofilo.pdf
    • http://obediencejourney.com/uploads/1/3/0/5/130589309/91994ef70c82a.pdf
    • http://bigleaguetomatoes.com/uploads/1/3/0/4/130488773/binunenikosubiba.pdf
    • http://rosslynscott.com/uploads/1/3/0/7/130775644/lulaparupudiriwopov.pdf
    • http://cmiraclelashes.com/uploads/1/3/0/3/130313135/tuvalu-zipeloratepagep-varitisux-kubodivej.pdf
    • http://theagencyexchange.com/uploads/1/3/0/6/130639712/4d6beed.pdf
    • http://www.transmac.nl/uploads/1/3/0/6/130621852/nizoserupon.pdf
    • http://rochester-santa.com/uploads/1/3/0/6/130639028/ced4331d0ce6874.pdf
    • http://harlowhudson.com/uploads/1/3/0/5/130551505/risukinu.pdf
    • http://finav.br/uploads/1/3/0/7/130776688/8442360.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009900.bin
d0e74f7673a396dc939f378c490461b7a47920c3bddad0636010916811ce8386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9900 9408 bytes
font_01_sfnt_off0000ba72.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA72 16036 bytes

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