Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06522eea274ea2d…

MALICIOUS

PDF

40.4 KB Created: 2020-04-03 07:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f0b59fe7d18f5da277c9f71ad076ab6f SHA-1: 890ad037bb24cbec338bfaeb5db27e91adbd15eb SHA-256: f06522eea274ea2debcc2b0d91165adbf4b6f9b8c68ecf733b4f02b1198d0b72
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of embedded external links, a technique commonly used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The document body contains text related to research problem delimitation and mentions the wkhtmltopdf tool, suggesting it might be a lure document. The primary attack pattern involves directing users to a multitude of external PDF files hosted across various domains.

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://sphsbasketball.com/uploads/1/3/0/2/130270779/130270779.html#delimitacion+del+problema+de+investigacion+ejemplos
    • http://redclaydesigns.com/uploads/1/3/0/8/130874641/fukotux-wasafusolufes-vawasevazer.pdf
    • http://lvlsactive.shop/uploads/1/3/0/7/130739197/womisipirep-sulodaka.pdf
    • http://blackfilmcentre.org/uploads/1/3/0/4/130476747/zakon.pdf
    • http://rowanmccallister.com/uploads/1/3/0/5/130588320/mubimojegulokux_goter_sofugawuxego.pdf
    • http://boricuaman.com/uploads/1/3/0/4/130476150/ruwafebowasazu.pdf
    • http://lacanadalimo.com/uploads/1/3/0/7/130740573/1321715.pdf
    • http://travelofamerica.biz/uploads/1/3/0/2/130287984/3408292.pdf
    • http://www.modernupcycle.com/uploads/1/3/1/4/131453061/popabuforika.pdf
    • http://ltdhelp.ca/uploads/1/3/0/2/130271078/sutowak.pdf
    • http://continentalsecurityconsulting.com/uploads/1/3/0/6/130604742/jezopezakinafiwamu.pdf
    • http://western-union-nhantien-vn.online/uploads/1/3/0/5/130544086/peganirava_zafem_jatelipaxu_bafowiwipetu.pdf
    • http://sandalkarakter.com/uploads/1/3/0/6/130604858/6cb368e3ddb6e.pdf
    • http://photosbyadrienned.com/uploads/1/3/0/6/130620346/nokodiwerabomuzuset.pdf
    • http://lindavanlaer.com/uploads/1/3/0/2/130271209/6b857da05661b.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_off000072d8.bin
f416ce79e454396e4914b99b828bb5017e536da2be318cbb0159f00f24dbafc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D8 8836 bytes

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