Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3d27b7da70cfc4…

MALICIOUS

PDF

46.0 KB Created: 2020-04-04 11:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: abf49f69c38109365034fc62145a3aaf SHA-1: aae3709cbd725ddc9229dacd42f9f30c345c30ac SHA-256: 6b3d27b7da70cfc4bea5d615dd5fa7f75e6110f8776501bdd2a8a4b88ac66ed7
96 Risk Score

Malware Insights

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

The PDF document contains a mass of external links to other PDF files hosted on numerous domains, a technique often used for SEO spam or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this finding. No scripts were extracted, but the document's structure and the heuristic firings indicate a malicious intent to redirect users 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://alexmcmichael.com/uploads/1/3/0/9/130969580/130969580.html#porque+se+dice+que+el+relieve+colombiano+es+diverso
    • http://woodlandadventurers.net/uploads/1/3/0/4/130490561/234812.pdf
    • http://youshopt.com/uploads/1/3/0/7/130776054/b1e7722c82c8a5.pdf
    • http://ningaui.net/uploads/1/3/0/5/130588210/tesume.pdf
    • http://ministryequalshelp.com/uploads/1/3/0/7/130775211/jaserajix-jefizozos.pdf
    • http://mrtoolbelt.info/uploads/1/3/0/5/130588745/lomuve.pdf
    • http://zambiasafarihunting.com/uploads/1/3/0/6/130639910/4065909.pdf
    • http://yourcoloursandstyle.org/uploads/1/3/0/7/130740010/kokakaraxax_rugos_mujiwopebivewe_zerogujuvuje.pdf
    • http://clsphotography.org/uploads/1/3/0/6/130604554/lusinobopofun_temukilozexogo_jikajob.pdf
    • http://jaredbilly.com/uploads/1/3/0/7/130738861/kisojaka.pdf
    • http://oneclick-photographer.com/uploads/1/3/0/5/130550858/0c71c2c07.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/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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068aa.bin
fd47c9a09e651d959a02bab461438004fef83e17b7c81b72f42cfbacd5b0f8d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x68AA 9256 bytes
font_01_sfnt_off000089ed.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x89ED 2652 bytes
font_02_sfnt_off00009354.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0x9354 16036 bytes