Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a05371c10253041…

MALICIOUS

PDF

38.9 KB Created: 2020-04-03 00:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8f8e0e06352d3f71d31483565242d562 SHA-1: 79a95b2b7fb1e6eb2ca5a22ef29e92ae673f0430 SHA-256: 7a05371c102530415194b47833cfcace991040cad92ca4ce9d54ab56fd9e064a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a method to distribute malicious content across multiple sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://bluefencing.com/uploads/1/3/0/7/130774978/130774978.html#human+anatomy+and+physiology+11th+ed
    • http://duct-install.com/uploads/1/3/1/1/131163920/navasikozuz_gapidawuraje_metofajurater.pdf
    • http://realgypsumsolutions.com/uploads/1/3/0/2/130292179/4603716.pdf
    • http://laligalatinafinanciera.com/uploads/1/3/0/7/130739294/6767901.pdf
    • http://shoelacecoding.co/uploads/1/3/0/4/130488123/5d4beb2b5603ed7.pdf
    • http://sausalitospace.com/uploads/1/3/1/3/131380895/nafebetulaledavuvaxa.pdf
    • http://tayastactics.com/uploads/1/3/0/9/130969481/xeraxalabap.pdf
    • http://lifestylesage.com/uploads/1/3/0/6/130604151/811436.pdf
    • http://omniplast-de.net/uploads/1/3/0/7/130739592/kuwapiworef.pdf
    • http://westtowninc.com/uploads/1/3/0/3/130323516/23ceb69b.pdf
    • http://ctcpuertomaldonado.org/uploads/1/3/0/7/130738823/88a22446.pdf
    • http://www.spadaforabibite.com/uploads/1/3/1/4/131437350/20433.pdf
    • http://nomobands.com/uploads/1/3/0/3/130379111/2f76e1e2768.pdf
    • http://interpro-books.net/uploads/1/3/0/2/130289233/vijutodokobudez.pdf
    • http://readcoolbeans.com/uploads/1/3/0/7/130775339/172726.pdf
    • http://msdeckersbeehive.com/uploads/1/3/0/7/130776276/6f9440.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_off00006f2b.bin
4cdbf7ee3e1fb851feb377284d87cb332b65abd16013bd978316e135e45123f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2B 8144 bytes

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