Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7e214ac5b30f1d…

MALICIOUS

PDF

69.9 KB Created: 2020-03-08 11:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f2378f5e6e4a8a0b0f7db1bab28d12bd SHA-1: 13be85626276cc61cc6249d1276ed5a037d1b1dc SHA-256: 0c7e214ac5b30f1d7129e06c26c71f787358129a3be783e31a9af53a65921bd0
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 documents, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

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://pbjconstructionllc.com/uploads/1/3/0/9/130969796/130969796.html#phylum+coelenterata+examples+with+names
    • http://fountainoffire.org/uploads/1/3/0/6/130621757/8f3cc14.pdf
    • http://mail.ohiomorganhorse.com/uploads/1/3/0/5/130550910/7cc3a2d21.pdf
    • http://outside-of-the-lines.com/uploads/1/3/0/7/130738526/a39a531.pdf
    • http://www.mslande2ndgradeclass.com/uploads/1/3/0/2/130273931/1660604.pdf
    • http://mivux.ch/uploads/1/3/0/7/130776626/3899107.pdf
    • http://www.flowerbardallas.com/uploads/1/3/0/8/130874046/9f054d38cdb1ad.pdf
    • http://infinitybisect.com/uploads/1/3/0/4/130488741/9eb807.pdf
    • http://logicaldesigner.net/uploads/1/3/0/5/130551991/7537285.pdf
    • http://paulsfavoritestuff.com/uploads/1/3/0/7/130740433/998002.pdf
    • http://legendarylumber.com/uploads/1/3/0/7/130739693/boxuzevigiduro-dazirosudavi-xolegemi.pdf
    • http://hockinghillsenergy.com/uploads/1/3/0/5/130539875/mezep.pdf
    • http://www.dkvinylinc.com/uploads/1/3/0/7/130776502/sofijavazefige.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_off0000c1ed.bin
57bf9feae6d29fbfe5e3d79edc08f10122a8ba709c5d459ee415d57c3fae5ab7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1ED 9284 bytes
font_01_sfnt_off0000e3c9.bin
2fe8de2bb85d36a4846f470afe576d72a6b930acabc0a2ebba498d7713600448
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 5072 bytes
font_02_sfnt_off0000f29d.bin
b3affdfdfee497c2d3230853582529cf395d265bfdbb8cde7d84ae9c33602211
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 16036 bytes