Malicious PDF — malware analysis report

Static analysis result for SHA-256 85643c256e29f5e3…

MALICIOUS

PDF

63.1 KB Created: 2020-06-02 03:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 058998742f11aa9869c80cc90d2702f6 SHA-1: 2d20dc7cec05932f515ac2a43ba960184ec9157a SHA-256: 85643c256e29f5e33a8094690f41b41be9b7c68f6e8c1558978f2097d641a83d
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to PDF files hosted on unrelated domains, suggesting a link farm for SEO manipulation or malware distribution. The document body, though heavily obfuscated, contains a URL that matches one of the extracted external links, reinforcing the malicious intent. The ML classifier also strongly indicated maliciousness.

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://immersivesafety.com/uploads/1/3/0/2/130288326/130288326.html#prueba+psicometrica+terman
    • http://adventuresbyprice.com/uploads/1/3/0/6/130603776/746a7a60c.pdf
    • http://stephaniebainyoga.com/uploads/1/3/0/5/130589384/afdf79de03.pdf
    • http://thesilverfantasy.net/uploads/1/3/0/6/130640150/5926605.pdf
    • http://aserethcorp.com/uploads/1/3/0/6/130604423/ripapufivowa-vaxitetu-buvojaga-luragujilesugim.pdf
    • http://pranaessentialoils.com/uploads/1/3/0/5/130539676/54110.pdf
    • http://sp-pulse.com/uploads/1/3/0/7/130776340/kuxijadixina_segux_momiginaxugod_natagawoben.pdf
    • http://immersivesafety.com/uploads/1/3/0/2/130288326/terms.html
    • http://immersivesafety.com/uploads/1/3/0/2/130288326/dmca.html
    • http://immersivesafety.com/uploads/1/3/0/2/130288326/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kutujowi.files.wordpress.com/2020/06/gomajisamuwog.pdf
    • https://duzawexosusa.files.wordpress.com/2020/05/xifexeninijavodo.pdf
    • https://nirakopifaz.files.wordpress.com/2020/05/wejogowuforadezevuraru.pdf
    • https://vedusax.files.wordpress.com/2020/05/vimajujupolubawidolekib.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_off0000c53d.bin
c6a5f87aeb52ab00ca1175d97ea13aaac3437e2f4ba61308641f8e06b67b83d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC53D 14172 bytes

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