Malicious PDF — malware analysis report

Static analysis result for SHA-256 0463e08a17ac7987…

MALICIOUS

PDF

34.3 KB Created: 2020-06-03 02:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89352783c408b305b5f929f82f14c1b6 SHA-1: 0374a5b888c3130c3a2970f39641a8f2f67d1733 SHA-256: 0463e08a17ac79871d6093b986609e8c96bfdc85b9f7143272087159255fd1a6
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. The primary URL, http://brimcghee.com/uploads/1/3/1/8/131856146/131856146.html#dessin+anime+caillou+a+la+mer, is likely part of a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://brimcghee.com/uploads/1/3/1/8/131856146/131856146.html#dessin+anime+caillou+a+la+mer
    • http://peakeandfrey.com/uploads/1/3/0/2/130289154/nefudezu.pdf
    • http://daydreamerphotography.org/uploads/1/3/0/2/130287367/voramukolulaxe.pdf
    • http://spotlights-online.com/uploads/1/3/1/4/131406970/boveponi-dojenudove.pdf
    • http://jamieparrish.com/uploads/1/3/0/4/130483514/6279782.pdf
    • http://amiconnections.com/uploads/1/3/0/3/130379065/0ff62ae79cbc5.pdf
    • http://brimcghee.com/uploads/1/3/1/8/131856146/terms.html
    • http://brimcghee.com/uploads/1/3/1/8/131856146/dmca.html
    • http://brimcghee.com/uploads/1/3/1/8/131856146/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jagunijo.files.wordpress.com/2020/05/11043618516.pdf
    • https://dufaxuxed.files.wordpress.com/2020/05/35765872735.pdf
    • https://jezulapiti.files.wordpress.com/2020/06/wezaduxixolejuvuwazewo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005744.bin
b258ab796227b0e2a1ac9d855392de85d656eb1f121b6cc695dded384c75751c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5744 11856 bytes

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