Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e32dd300eb0616…

MALICIOUS

PDF

35.5 KB Created: 2020-06-06 09:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2823cf1a178213ff97d1d079231db3f SHA-1: 45b20e4424fec01a19b7912e3e95ef14cd5c1822 SHA-256: 12e32dd300eb0616f26152799186be23ad418989ab8c55c648888a8b3ddffd8f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on suspicious domains. This behavior is indicative of a link farm or a mechanism to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the ML classifier's high confidence suggest malicious intent, likely related to SEO manipulation or content distribution.

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://hostmaster.atlastrekshop.com/uploads/1/3/0/4/130491757/130491757.html#permanente+es+inmutable+como+permuta
    • http://taraxhouston.com/uploads/1/3/1/4/131483002/zafijabow.pdf
    • http://ancleaningservices.net/uploads/1/3/1/6/131637271/zetenefuxizesapifeta.pdf
    • http://webmail.icareunited.org/uploads/1/3/0/2/130288642/jasejagobenowum.pdf
    • http://espotif.com/uploads/1/3/0/9/130969424/5880942.pdf
    • http://conference2018.ox-fest.org/uploads/1/3/0/3/130313610/wigoxejotikema-telugojiriwi-pululego.pdf
    • http://homeonlinehosting.com/uploads/1/3/0/7/130739540/pivareliwamifoz-gojezifara.pdf
    • http://anniepattersonconsulting.com/uploads/1/3/0/7/130775443/db7b04.pdf
    • http://instituteb.com/uploads/1/3/1/4/131453274/4e3a10b2ce63b.pdf
    • http://tayloreco.com/uploads/1/3/1/0/131070702/perono-banenadizor-xadimutazexewox-susubax.pdf
    • http://voluntourismargentina.com/uploads/1/3/0/6/130605292/situkusaja_zifaminuweb_gubon.pdf
    • http://thisisblacklung.co.uk/uploads/1/3/1/3/131382217/ac969b.pdf
    • http://hostmaster.atlastrekshop.com/uploads/1/3/0/4/130491757/terms.html
    • http://hostmaster.atlastrekshop.com/uploads/1/3/0/4/130491757/dmca.html
    • http://hostmaster.atlastrekshop.com/uploads/1/3/0/4/130491757/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tomejaz.files.wordpress.com/2020/06/60644104643.pdf
    • https://gurofis.files.wordpress.com/2020/06/10894103945.pdf
    • https://tuzidel.files.wordpress.com/2020/06/jepimatuba.pdf
    • https://jazinap566325878.files.wordpress.com/2020/06/58806250330.pdf
    • https://borafitafule.files.wordpress.com/2020/06/74941492169.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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ed3.bin
b4b874191512b8a34faa2a95ecad06d1cc94423ee9774332a3a33020744b22ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED3 10840 bytes