Malicious PDF — malware analysis report

Static analysis result for SHA-256 09550fdad82da67b…

MALICIOUS

PDF

45.7 KB Created: 2020-03-15 02:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b8414630264c491c03f76ff97a25a2fd SHA-1: 45632188bd43ae73702870472901eae1ef43a980 SHA-256: 09550fdad82da67b07adc848f8f87183597292f0eef708e4c7502e4b42c65aab
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body text appears to be obfuscated or corrupted, but the presence of numerous links suggests an attempt to manipulate search engine results or redirect users to potentially malicious content hosted on these domains. No scripts were extracted from this sample.

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://e9crt6.brdge.org/uploads/1/3/0/4/130435721/130435721.html#meiosis+and+mitosis+practice+2+answer+key
    • http://bharpermd.com/uploads/1/3/0/2/130291416/7f98a2c1.pdf
    • http://goversatile.com/uploads/1/3/0/2/130270895/8915023.pdf
    • http://www.anchorchurchelpaso.com/uploads/1/3/0/9/130969243/f85b919.pdf
    • http://socialcollaboratory.org/uploads/1/3/0/4/130483761/2594941.pdf
    • http://midshiftmedia.com/uploads/1/3/0/7/130775835/rezefosevuxo-woxududiwedoxot-sowizaw-baridowabupofe.pdf
    • http://vitalsolutionsllc.org/uploads/1/3/0/5/130590191/f3892.pdf
    • http://nowphotobooths.com/uploads/1/3/0/6/130621717/725a48ca8.pdf
    • http://www.wikinstedia.com/uploads/1/3/0/6/130620678/509f4.pdf
    • http://kuwtjd.com/uploads/1/3/0/6/130605279/7f90f0dceb.pdf
    • http://www.jessicabrownmusic.net/uploads/1/3/0/7/130775833/9403b577e342105.pdf
    • http://www.zenshiatsuforall.com/uploads/1/3/0/3/130313470/sodiwetuwavevepob.pdf
    • http://goingfarr71717.com/uploads/1/3/0/3/130323154/magot.pdf
    • http://philforrence.com/uploads/1/3/0/4/130477287/dd332.pdf
    • http://www.studiounsoinpoursoi.ca/uploads/1/3/0/5/130588570/xomasodanawazovebi.pdf
    • http://yctl.org/uploads/1/3/0/7/130775053/05ffebde1aef.pdf
    • http://nextbillionventures.com/uploads/1/3/0/5/130541186/biladas.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_off0000865b.bin
34662f0641b446d0856c18d6dc425a2cf663c8b60c54d0fcf26e23bd6005e698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x865B 9212 bytes

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