Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc98651fa9b6d32…

MALICIOUS

PDF

36.3 KB Created: 2020-04-01 17:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2aec75c75154ea6f7dade6279d44aed5 SHA-1: 354abf2cfccdc01540e85c61aedaf3bd76a99a4b SHA-256: 4dc98651fa9b6d324a970005776e821f78675ef22c66cde2b7f56ad758ba63b4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the numerous external links. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://thecreativeclick.org/uploads/1/3/0/7/130740498/130740498.html#dos+ejemplos+de+reproduccion+por+biparticion
    • http://3dbybill.com/uploads/1/3/0/5/130539019/petinalaxatedu.pdf
    • http://voiceyour.love/uploads/1/3/0/5/130542729/48009d.pdf
    • http://smartcubellc.com/uploads/1/3/0/7/130776111/jagesisawe.pdf
    • http://praktijkmariaelena.nl/uploads/1/3/1/3/131398487/rugujojul.pdf
    • http://iviaggichevuoi.com/uploads/1/3/0/2/130289237/710040.pdf
    • http://oakleycafe.com/uploads/1/3/0/9/130969118/kader_gudiverobifuk_gevatexob.pdf
    • http://ritterschild.medievalknightshields.com/uploads/1/3/1/4/131437161/vozipidedapebebad.pdf
    • http://vcportalstudent.com/uploads/1/3/0/9/130969226/kavukefut.pdf
    • http://southpointrunning.com/uploads/1/3/0/3/130323355/nagoviveledij_divutuzoz_kovorago_xutoxan.pdf
    • http://theyahoomagician.com/uploads/1/3/1/4/131408546/2281c84e5c.pdf
    • http://hklconstruction.com/uploads/1/3/0/6/130640107/7101124.pdf
    • http://nourishmentwise.com/uploads/1/3/0/2/130289236/gejegazazunogon-zoxusotexaj.pdf
    • http://kendramarshall.com/uploads/1/3/0/8/130813111/jaripavojek_tapovutag.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_off0000655e.bin
52171bf4a3a8001f12d54c0d60720b8ce951dffe73909e3d3c8ca1fb12b01949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x655E 7916 bytes

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