Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ad891508f85137…

MALICIOUS

PDF

44.6 KB Created: 2020-03-29 21:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f1287e0670bf7eca4219d569b726427c SHA-1: df61bf48bcf077f638cb5d7a024ad7ba5a1bd56c SHA-256: c8ad891508f8513758f70e8cc06dc56448c3d35fd510a26bd7d2a9b4ca5a915b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains several URLs that are part of this link farm. The primary attack pattern appears to be directing users to a vast collection of other PDF files hosted across numerous domains, potentially for SEO spam or to serve as a distribution point for further malware.

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://cpanel.ladse.org/uploads/1/3/0/4/130476732/130476732.html#temas+del+cuento+fantastico
    • http://mail.amandaschultzphotography.com/uploads/1/3/0/2/130287289/fa2ce0.pdf
    • http://guydance.com/uploads/1/3/0/6/130604788/f6c2d146344ad6c.pdf
    • http://thevillagemiami.com/uploads/1/3/0/3/130379291/raseja.pdf
    • http://cscschorus.com/uploads/1/3/0/4/130476266/sazejug.pdf
    • http://californiaacceleratedresolutiontherapy.com/uploads/1/3/0/4/130476538/wopomoko.pdf
    • http://laughnlearnchildcare.org/uploads/1/3/0/5/130588499/tosonamuzemuwigipik.pdf
    • http://surlocal.com/uploads/1/3/0/7/130739048/7815426.pdf
    • http://rhiannonlisettehenry.com/uploads/1/3/0/6/130620778/jifonevarusapo-siputibure-vatilib-tinonepikapal.pdf
    • http://shaka1652photos.com/uploads/1/3/0/6/130603942/7513516.pdf
    • http://thegaywhostrayed.com/uploads/1/3/0/8/130813992/d17fde62f0c94c8.pdf
    • http://chicagovoicetalent.com/uploads/1/3/0/5/130542717/653985c.pdf
    • http://mikejapan.com/uploads/1/3/0/6/130620781/b83679539289.pdf
    • http://mindfulnessbeginnings.com/uploads/1/3/0/6/130621359/suvuzaw.pdf
    • http://colorcountertops.com/uploads/1/3/0/7/130739653/bavulifijarij_topukiv_dudubexed_zapopulanegape.pdf
    • http://theprecisiongroupllc.net/uploads/1/3/1/3/131384017/munonek.pdf
    • http://ronnicachapman.com/uploads/1/3/0/7/130775935/5bced3d20ef6836.pdf
    • http://swampersoriginal.com/uploads/1/3/0/6/130639045/76f3bbf8098f54.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_off000082f2.bin
847d5f9ef7c6ba88e546bce3a56fd2085f1462c297622a084cd1e5e0b4c0667f
pdf-font-stream PDF embedded font (sfnt) at offset 0x82F2 8928 bytes