Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd7b25cc904921b…

MALICIOUS

PDF

39.5 KB Created: 2020-04-29 16:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b12733ed07e726cf5704ffdb4af9c275 SHA-1: 850c477dffe9fa5d2cb05839d2b297df974d2a97 SHA-256: 7bd7b25cc904921b0887e8aa7a958744dd46fc9908898426c8be53e195db20bf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URIs suggests an attempt to host or link to further malicious content. While no scripts were directly extracted, the PDF structure and link farm heuristic indicate a malicious intent, likely to deceive users into downloading or visiting compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wrigg.org/uploads/1/3/1/8/131872239/131872239.html#adobe+illustrator+software++for+windows+8.+1
    • http://marydee.org/uploads/1/3/0/4/130489572/1581162.pdf
    • http://dailyherbs.eu/uploads/1/3/0/5/130551008/1932851.pdf
    • http://caribbean-vending.com/uploads/1/3/0/5/130588807/2518701.pdf
    • http://stellasales.ca/uploads/1/3/1/0/131069824/vuvuxebixanagowegu.pdf
    • http://alairdpropertiesllc.com/uploads/1/3/0/3/130312971/kefidaz_vavipanozelel_vonalokijexepog.pdf
    • http://souldecor.org/uploads/1/3/0/5/130588548/tugawe_fimexamidabogi.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c5f.bin
3e7fdfc5925717d2e54559e2b6f333347776c8ed5077d39aaee0d5d1401ce4d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5F 8336 bytes
font_01_sfnt_off00007c73.bin
45c39c4315a5d00962143d4102937301eb2649728d6de39b959633cfc30365c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C73 16144 bytes

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