Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80a5e16ae081843…

MALICIOUS

PDF

34.9 KB Created: 2020-04-09 05:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cd346856fa0af15143cef3ea8e12ad24 SHA-1: 3f9433a048aa0779d00dd809da92a348af2580db SHA-256: e80a5e16ae08184345b19f03313ce1e0819307ef81de8d6347671a4ce269cf5e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of external links to various domains, indicating a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to drive traffic to these external sites. The ML classifier also strongly indicated maliciousness. The embedded URLs are the highest priority IOCs for further investigation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nowherenorthofficial.net/uploads/1/3/0/7/130776325/130776325.html#nelson+mathematics+7+textbook+answers+pdf
    • http://cleanadog.com/uploads/1/3/0/9/130969045/jikovutolaxepe-jodadegum-gofevim-xotuzugafixezif.pdf
    • http://nobakebodycare.shop/uploads/1/3/0/7/130740013/ff29f45b663.pdf
    • http://jvwalker.com/uploads/1/3/0/6/130639092/gatelelavasuvaza.pdf
    • http://fditrucking.com/uploads/1/3/0/4/130478110/vusigora.pdf
    • http://m-lev.net/uploads/1/3/1/1/131164424/miwelitimelotaj_tuzasidotupixi_konuwugugiz.pdf
    • http://iamfound-us.org/uploads/1/3/0/7/130775951/3174533.pdf
    • http://lclreporter.com/uploads/1/3/1/4/131406846/rifebeg_tivinawuz_pubekoj.pdf
    • http://apexresidential.net/uploads/1/3/0/6/130640023/2062285.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_off00006222.bin
53f27a13e3e55105f5e9867d1d71e740b977c3be00b0c01227c66eee8b4b25cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6222 7264 bytes

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