Malicious PDF — malware analysis report

Static analysis result for SHA-256 719373d5c686c106…

MALICIOUS

PDF

34.9 KB Created: 2020-03-26 03:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b25bc9cd97a5bb8d239017bfaa4241c0 SHA-1: e266b356de4be680d435b4e29e605cfd01177681 SHA-256: 719373d5c686c106ab301d29c68e34bff8c9f661a1025bbac861036da26761a7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings strongly 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://2020blue.org/uploads/1/3/0/4/130476135/130476135.html#sugar+robin+schulz+lyrics
    • http://pondpeople.org/uploads/1/3/0/7/130776725/afe7bbf15.pdf
    • http://dearduffconsultingagency.com/uploads/1/3/0/6/130639091/zukovugi-budajabalajeno.pdf
    • http://camphopeless.io/uploads/1/3/0/6/130620293/vikaronimuboxovaxo.pdf
    • http://ardmorevetservices.com/uploads/1/3/0/5/130551208/mirakanazebizup_pikobuzeso_zafiro_mukudog.pdf
    • http://www.lepoissonlune.fr/uploads/1/3/0/9/130969492/8070329.pdf
    • http://aikosilkart.net/uploads/1/3/0/6/130604110/ca84f441e6039e.pdf
    • http://buffalolagoon.com/uploads/1/3/0/6/130604133/beludosozebogeleju.pdf
    • http://www.hayatiminaynisi.com/uploads/1/3/0/8/130813922/3950620.pdf
    • http://greatlakescadcam.com/uploads/1/3/1/0/131070147/boxusoguxemagiv.pdf
    • http://womensrevouloutionwrestling.com/uploads/1/3/0/6/130604804/vuluxipozonu.pdf
    • http://hopefloatsproject.com/uploads/1/3/0/6/130621527/1590209.pdf
    • http://paulchow.net/uploads/1/3/0/4/130488332/e551d8f8be7d9.pdf
    • http://bettersignblanks.com/uploads/1/3/0/7/130738711/8984888.pdf
    • http://lightmatter.eu/uploads/1/3/0/7/130739353/guduf.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_off00006144.bin
6aff674fe895b944c8694554ef5f6a26e25e3bee5e91b8fca3785385eb303650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6144 7628 bytes

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