Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd95f6d960f49b3e…

MALICIOUS

PDF

44.1 KB Created: 2020-03-09 11:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 159257cce92d00be2afbbb7f66fc90a8 SHA-1: 69085915dfa1a242cc62f1d41a78409edcd4d8df SHA-256: bd95f6d960f49b3e816deb0f289703262396077c069fe62d31eff4f6eb89d64b
94 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 pointing to various PDF documents hosted on different domains. This behavior is indicative of a link farm or SEO spamming technique, potentially used to distribute malicious content or manipulate search engine rankings. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

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://antiquefest.org/uploads/1/3/0/2/130289503/130289503.html#ielts+problem+solution+essay+introduction
    • http://sop.wv469.com/uploads/1/3/0/7/130739974/lisebitewafafokeg.pdf
    • http://itsjewelrytime.com/uploads/1/3/0/7/130775364/3682055.pdf
    • http://konidarisart.com/uploads/1/3/0/3/130312919/3559827.pdf
    • http://bmphotographer.com/uploads/1/3/0/3/130324126/lurixumafipola.pdf
    • http://301smainneia.com/uploads/1/3/0/2/130288439/e298d9900157966.pdf
    • http://smarterdarter.com/uploads/1/3/0/5/130590164/jivepa.pdf
    • http://husaynjamal.ca/uploads/1/3/0/8/130873863/9228ae257.pdf
    • http://www.thesoarmethod.com/uploads/1/3/0/6/130620769/2402946.pdf
    • http://smtp.lehrco.com/uploads/1/3/0/5/130589080/3bc912305773a67.pdf
    • http://store.halftheskydesigns.com/uploads/1/3/0/4/130436451/468835.pdf
    • http://host9.celestecorp.com/uploads/1/3/0/7/130775758/nexefufuzufuli_vakidorume.pdf
    • http://college-elf.com/uploads/1/3/0/5/130546076/1701389.pdf
    • http://abundantlifehealthandwellness.net/uploads/1/3/0/6/130603907/remuvoguwomol-rekabovaxagemu-bewomexekizarut.pdf
    • http://becausegoodness.com/uploads/1/3/0/3/130313634/6113220.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_off000083f1.bin
eab6fa47d6a33f3ce929d9760bd8933680c0c7c1d6ae0fe6ea9644f485ff7efa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83F1 7620 bytes

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