Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f63a830a893e304…

MALICIOUS

PDF

35.8 KB Created: 2020-04-07 07:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 155b203f1d2829f303f22fdbc5a662b9 SHA-1: eaf4ca6a10ea2b43483e31f6e173be94cc15dee8 SHA-256: 9f63a830a893e3044d19e09acf4dfc2c231b05a3603619416d745923d8495052
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to uniquely named PDF files on various domains. This behavior is indicative of a link farm designed to manipulate search engine results or lure users to malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous unknown reputation URLs is a significant indicator of malicious intent.

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://creativerastudios.com/uploads/1/3/0/7/130739351/130739351.html#derechos+y+obligaciones+de+una+persona+fisica+y+moral
    • http://takusicompanylimited.net/uploads/1/3/0/8/130814283/kejadikogegiz.pdf
    • http://chante-ishta.com/uploads/1/3/0/5/130542728/fubosudenu-bifuku.pdf
    • http://cleancrawl.space/uploads/1/3/0/3/130323693/narup.pdf
    • http://flavabeatz.com/uploads/1/3/0/5/130543569/68ca998b5e90.pdf
    • http://mensinnerclub.com/uploads/1/3/0/6/130621707/5070440.pdf
    • http://parkwoodcrossingpresentation.com/uploads/1/3/0/2/130288468/b185cd996.pdf
    • http://3333nfranklin.com/uploads/1/3/0/8/130874691/xuxemuwumusigob.pdf
    • http://www.latinosandtech.berkeley.edu/uploads/1/3/0/6/130621292/59b620c631c96ef.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_off0000617a.bin
ae41d21f435eef31517e81896a5745ded22416d9251df5ae29e205a14d4adce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x617A 8544 bytes

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