Malicious PDF — malware analysis report

Static analysis result for SHA-256 015e4ea863b569d9…

MALICIOUS

PDF

33.0 KB Created: 2020-04-05 11:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f926b82c3ca0b126e1865bd4e61f75b7 SHA-1: f7bbcdd94fc5da8aaf8f1c8b11d4e13dd91e3dce SHA-256: 015e4ea863b569d9c3f9eabf80ad120288ca14370dc18918d2522b9625d1667c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect the user 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://live4todayusa.org/uploads/1/3/0/6/130639145/130639145.html#ejercicios+de+ecuaciones+con+valor+absoluto+resueltos+pdf
    • http://huepfstern.com/uploads/1/3/0/7/130776490/farubusin-gemako.pdf
    • http://kennyhphotography.com/uploads/1/3/0/8/130813783/5064968.pdf
    • http://theleanfigcoachingcompany.com/uploads/1/3/0/6/130620681/daraxedivubaso_xitorixer.pdf
    • http://peacelovebikinis.com/uploads/1/3/1/3/131398417/foguzunowi.pdf
    • http://safechildcoalition.net/uploads/1/3/0/3/130323421/2196276.pdf
    • http://workxz.com/uploads/1/3/0/6/130621140/pekotewuwemele_lorebejive.pdf
    • http://dbamfordlearning.com/uploads/1/3/0/7/130739315/3917991.pdf
    • http://eastmichiganeyecenter.net/uploads/1/3/0/8/130873732/3822581.pdf
    • http://csportsafety.com/uploads/1/3/0/8/130874009/kibatilanivan.pdf
    • http://dylancoleofficial.com/uploads/1/3/0/7/130739303/nolufi.pdf
    • http://shhmeeze.com/uploads/1/3/0/9/130969684/2789997.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_off00005527.bin
f381315bf76206402799cfa5435947f787bfe13546863226d4e52fa4f8852bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5527 8584 bytes

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