Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4fa5bb7462c1c6…

MALICIOUS

PDF

40.7 KB Created: 2020-03-22 09:25:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0a445e57312f4100c82ccd324b41f6d9 SHA-1: faf5f745ac631b7b86bc304c8ea750498d44bdb1 SHA-256: 3f4fa5bb7462c1c6e0eb147b0ea604537755ca16f40de4adaec2a3ceffd546b8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be a link farm designed to direct users to external resources, potentially for SEO manipulation or to host further malicious content. No scripts were extracted from this sample.

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://christinafriedle.org/uploads/1/3/0/4/130436289/130436289.html#toyota+axio+2007+car+manual
    • http://bearvbaby.net/uploads/1/3/0/7/130739333/9896577.pdf
    • http://regisrealtygroup.com/uploads/1/3/0/5/130588230/repikej_navojalagegit_xuzekevij.pdf
    • http://elenay.org/uploads/1/3/0/7/130739876/sabufevinoka_duvaz_zimidovirera.pdf
    • http://www.forestbathingboise.com/uploads/1/3/0/9/130969699/vutopolemi_kujukeguxokak_jifejux.pdf
    • http://www.codykelleyfishing.com/uploads/1/3/0/6/130622063/ritedoxo.pdf
    • http://justmonkeybizness.com/uploads/1/3/0/6/130604452/wilix_kubovuwutije_divareviwinewa_xesopu.pdf
    • http://www.bethanynewlife.net/uploads/1/3/0/5/130541465/doxibogor.pdf
    • http://strategytitans.com/uploads/1/3/0/2/130287527/luzezubiv.pdf
    • http://airoparkourfreerun.com/uploads/1/3/0/4/130476462/6774655.pdf
    • http://azpadu.com/uploads/1/3/0/4/130491599/3832328.pdf
    • http://www.srvywatch.com/uploads/1/3/0/6/130603878/9992889.pdf
    • http://thepinkmews.com/uploads/1/3/0/3/130323602/velenakinarava.pdf
    • http://escaperoomfairfax.com/uploads/1/3/0/7/130738503/21632.pdf
    • http://wohlleben.org/uploads/1/3/0/9/130969334/kedekijenazo-tisetulara-zebukudeku.pdf
    • http://cpanel.hookah-corner.com/uploads/1/3/0/5/130538997/e2c02fac08152.pdf
    • http://www.casasolsjc.com/uploads/1/3/0/3/130323091/cb4fe330a.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_off00007645.bin
f54c91ad5dde1a5e01419c31a049645f33e47b472f1cf690e13931056a9d9349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7645 8148 bytes

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