Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3fc61235e72c81…

MALICIOUS

PDF

38.4 KB Created: 2020-04-11 10:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d8232ba6e12abc1f78d1d040bf340707 SHA-1: 88ba97c64e0bcb54178f01e0d56e9089e16d1bc9 SHA-256: de3fc61235e72c81ee91e24433988d3edeff90b7919da61c34436cc8eb64cb7d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains. The primary URL, http://74-123-73-16.mgwnet.com/uploads/1/3/1/6/131637211/131637211.html#ejercicios+de+probabilidad+binomial, suggests a lure related to educational material. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The presence of numerous SEO-like links points to a link farm or content-spinning technique to distribute malicious 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://74-123-73-16.mgwnet.com/uploads/1/3/1/6/131637211/131637211.html#ejercicios+de+probabilidad+binomial
    • http://shopprincessopal.com/uploads/1/3/0/9/130969993/budol_sirixofij_gibisosopama.pdf
    • http://motorcyclesonmainstreet.com/uploads/1/3/0/3/130323216/pujamuvuturilupa.pdf
    • http://ghannam-alsayegh.com/uploads/1/3/0/5/130542758/3b0d05.pdf
    • http://scentfromlove.com/uploads/1/3/0/5/130539129/8770682.pdf
    • http://cateringbychristian.com/uploads/1/3/1/4/131412181/c4195f881907.pdf
    • http://jesseswarriors.com/uploads/1/3/1/0/131071127/3051456.pdf
    • http://garrett-mills.com/uploads/1/3/0/5/130539697/nipukav.pdf
    • http://lydiadunkle.com/uploads/1/3/0/5/130551943/971e89.pdf
    • http://rcdresumes.com/uploads/1/3/0/7/130775612/basefesuvurit.pdf
    • http://travopitino.com/uploads/1/3/0/6/130639690/ba51fe4.pdf
    • http://ionizedsolutions.com/uploads/1/3/0/6/130639591/5455733.pdf
    • http://hylandebtfund.com/uploads/1/3/0/6/130639037/zedolik-wawetejaluv-mamuva.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_off000069dd.bin
a02b01e39573bdc6e3635553635b080d1b1f6ad24428117cce193c7fb2ea3c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DD 9272 bytes

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