Malicious PDF — malware analysis report

Static analysis result for SHA-256 0637976370b9e74e…

MALICIOUS

PDF

35.5 KB Created: 2020-05-04 02:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3418429d8af41e5a8127167cfb51b497 SHA-1: 23971dbe4e5322c9daaf6afeb0fccbf41d6214f4 SHA-256: 0637976370b9e74e70c71fd6354301d6c46714d4bcb9aaebc177474eb6cf382f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though partially corrupted, contains a URL that aligns with the observed link farm pattern. The primary function appears to be redirecting users to numerous external sites, potentially for SEO spam or to host further malicious content.

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://becdaxis.com/uploads/1/3/0/9/130969041/130969041.html#dotted+cursive+writing+practice+sheets
    • http://gabydelossantos.com/uploads/1/3/0/3/130324241/4477402.pdf
    • http://ssucompilationalbum.com/uploads/1/3/0/7/130776692/bozufavixix-jofef-wekugixigarure-vonudi.pdf
    • http://ekklesiainsights.org/uploads/1/3/1/4/131453712/9953355.pdf
    • http://jennybackeberg.com/uploads/1/3/0/4/130483867/torizigugoxusorefox.pdf
    • http://mygas.vip/uploads/1/3/0/6/130639055/lenuzak.pdf
    • http://jsbinvestments.net/uploads/1/3/0/9/130969511/4278211.pdf
    • http://pycdrafting.com/uploads/1/3/0/4/130483416/vajiriwesozutafosu.pdf
    • http://nutravelsolution.com/uploads/1/3/1/3/131380213/3e0609fa8c0.pdf
    • http://eox-masterbatches.com/uploads/1/3/0/7/130776413/1ba0d.pdf
    • http://thegoodappleyogastudio.com/uploads/1/3/0/6/130621569/bagufuxal.pdf
    • http://plasmova.com/uploads/1/3/0/3/130379062/7cd64f0ee5e2183.pdf
    • http://thesanluisvalley.com/uploads/1/3/0/9/130969639/vamawimifosu_lerejeja_pabuvurufada_ruboronusiriz.pdf
    • http://lesamisdumoulinneuf.com/uploads/1/3/0/7/130739975/mipexukopakarapuku.pdf
    • http://bluestonewinery.com/uploads/1/3/0/8/130873791/nakuwivanix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00005fd3.bin
77fa301f85bb0d0eca0bf8f33eb540127c1ccd01c5c6b55ca64b01b1eb746412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD3 10732 bytes

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