Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e3f2253b28e3c8…

MALICIOUS

PDF

47.1 KB Created: 2020-03-14 18:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c9c6da6b729b41dedcecf8a66f7c096a SHA-1: c636af64ec22166db02f26e076f917aa24f2dc56 SHA-256: 74e3f2253b28e3c806ae709b264bad1d5a606de44dd8b17db115a1f6140b5e87
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though malformed, contains references to URLs that are part of this link farm, suggesting a coordinated effort to direct users to potentially malicious content or for SEO manipulation.

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://hostmaster.4140designs.com/uploads/1/3/0/9/130969931/130969931.html#aws+auto+scaling+cloudformation+template
    • http://kwarsmoothieshop.com/uploads/1/3/0/6/130604408/5958887.pdf
    • http://nispenadkbuilders.com/uploads/1/3/0/5/130551962/nogawipenejoba.pdf
    • http://mta-sts.mx.connecticutlabradoodles.com/uploads/1/3/0/4/130436140/varowotu_libax.pdf
    • http://bostonwordpressdesign.com/uploads/1/3/0/7/130739492/353a4b19ea.pdf
    • http://amazingcreationstaxidermy.com/uploads/1/3/0/3/130313015/zobirimasadope-baxojobux-xozimiwasir.pdf
    • http://www.mikewaterton.com/uploads/1/3/0/3/130313649/bufebupoteniz.pdf
    • http://jessejenner.com/uploads/1/3/0/6/130604452/3058102.pdf
    • http://greenwichvillagefilms.com/uploads/1/3/0/8/130814984/5932903.pdf
    • http://bluestarwellness.ridersedgetherapy.com/uploads/1/3/0/3/130323453/8476484.pdf
    • http://www.ktmentertainmentandevents.com/uploads/1/3/0/4/130483345/49cea490.pdf
    • http://ibuyhousesva.com/uploads/1/3/0/4/130436226/3fc2122.pdf
    • http://laughingduck.org/uploads/1/3/0/2/130272648/bipita.pdf
    • http://mybellaboop.com/uploads/1/3/0/4/130476738/4f0479c16be9.pdf
    • http://milwaukiecentequiltshow.org/uploads/1/3/0/4/130483767/pagexiritijefowifa.pdf
    • http://deannaheon.com/uploads/1/3/0/5/130546977/2280242.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f48.bin
5278024270de67705d3a5034a26ce2f5e1d9e53f50705cc770b2190155f81e7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F48 6728 bytes
font_01_sfnt_off00008feb.bin
b0bbc2c17e02c95d071eb20686ebaaecf1be4808ed0a5f737b835856256a4520
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FEB 8048 bytes