Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcb97732efbfb50…

MALICIOUS

PDF

50.4 KB Created: 2020-04-12 06:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9526c11e61d5cf878860995345c63844 SHA-1: 8495c1f75d292d44bad42496c88fdb78112a3fe1 SHA-256: 5bcb97732efbfb5070730e39ee4a5bff192e8ba9cc992de57a2666dfb4e7ffa5
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier strongly indicated maliciousness. The embedded content, though heavily obfuscated, contains URLs that are likely used to redirect users to malicious sites or to host further malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

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://gulfcoastinvitational.com/uploads/1/3/0/5/130551704/130551704.html#voluntad+de+poder+nietzsche+pdf
    • http://district197middleschoolsports.com/uploads/1/3/0/3/130312964/xumegugizatobum_darupun.pdf
    • http://gothic-flicks.com/uploads/1/3/0/8/130813111/93a1d2b4c6c.pdf
    • http://raycoudrietbuilder.com/uploads/1/3/0/6/130639514/komedo-xigamaseba-xigefisedu-dejer.pdf
    • http://reconnect-with-yourself.com/uploads/1/3/1/4/131454536/8655785.pdf
    • http://skymanmusic.com/uploads/1/3/1/3/131379944/9434088.pdf
    • http://salomonk.com/uploads/1/3/0/5/130542860/223b9a81e96cf7.pdf
    • http://bellarosacr.com/uploads/1/3/0/5/130544070/kuwejosajosonaburiti.pdf
    • http://carlosferreiraofficial.com/uploads/1/3/0/3/130379590/9ebb7.pdf
    • http://hhscvte.org/uploads/1/3/0/7/130776175/xifuganafiluwep-xabido.pdf
    • http://soulsforkids.com/uploads/1/3/0/6/130621871/pososuweta-zewizami-waxuguz.pdf
    • http://andrebretonracing.com/uploads/1/3/0/6/130603959/noxur.pdf
    • http://tesoroshaven.com/uploads/1/3/0/5/130540664/nodejumi_gugip_xebefalakibat.pdf
    • http://luka-door.ca/uploads/1/3/0/3/130379377/1a7a7dbbc.pdf
    • http://elomla.com/uploads/1/3/0/6/130622075/2183100.pdf
    • http://carmichaelsrestaurant.com/uploads/1/3/0/7/130740049/pejusarepaz-davuf-wimurapifikufes-sekoferi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007930.bin
7d560a939464de35637ad87127bcbe64c93bee06f720664ed380dbf92bb75f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7930 10352 bytes
font_01_sfnt_off00009cd5.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD5 2652 bytes
font_02_sfnt_off0000a63c.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA63C 16036 bytes

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