Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d479737b2fb7662…

MALICIOUS

PDF

50.4 KB Created: 2020-03-29 05:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cd225e744357a8ccea75e4ab59740212 SHA-1: d612ac68d47f86e764a7251b7ab65cc59f4b7ebe SHA-256: 7d479737b2fb7662b258a0b61afebe3ac4b9de05d400f88696877e69a5ca9826
96 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious websites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were explicitly extracted, the embedded links themselves serve as the primary attack vector, directing 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://74-123-77-115.mgwnet.com/uploads/1/3/1/3/131398296/131398296.html#objetivo+de+diagnostico+de+salud+comunitaria
    • http://jobsholic.com/uploads/1/3/0/7/130740344/6074018.pdf
    • http://salon413.org/uploads/1/3/0/3/130379351/fibezujew.pdf
    • http://minnesotafutsalacademy.com/uploads/1/3/0/6/130639831/gezakuzino.pdf
    • http://mta-sts.mx.piercecountyscd.org/uploads/1/3/0/6/130604306/ketusuxuvum.pdf
    • http://teamk9academy.com/uploads/1/3/0/7/130776158/b610508eb2.pdf
    • http://nextlevelboards.com/uploads/1/3/0/4/130478484/vuxitonab-tafodixaxag.pdf
    • http://rockfordauctioncentre.com/uploads/1/3/0/6/130604342/bewofu.pdf
    • http://luxuryfauxfloral.com/uploads/1/3/0/8/130874286/bopinatun.pdf
    • http://inwyo.com/uploads/1/3/0/6/130621758/2696995.pdf
    • http://milescan.com/uploads/1/3/0/6/130621506/22059.pdf
    • http://www.bareinessence.com/uploads/1/3/0/9/130969445/ruwesaluxapobi.pdf
    • http://benjaminburnham.com/uploads/1/3/0/6/130603858/2379217.pdf
    • http://naturalsforthenatural.com/uploads/1/3/0/7/130739963/14cbaf1f5a77.pdf
    • http://rmhcredshoegala.com/uploads/1/3/0/4/130479435/pevun-savedu-berogasamikanu.pdf
    • http://stcolumbanusalumni.org/uploads/1/3/0/8/130874369/pujeviximini.pdf
    • http://www.thatsmeteesandmore.com/uploads/1/3/0/2/130287989/bakegu-wajulivaxez-fabujadez-tilugadived.pdf
    • http://www.hopfmowingservice.com/uploads/1/3/0/9/130969673/sugatesipukojixar.pdf
    • http://masjidabuhuraira.org/uploads/1/3/0/5/130551335/bidasuxurivi-webigumaxibemem-fijadedadil.pdf
    • http://drivegauge.com/uploads/1/3/0/7/130776760/mutezup_defibakebeti.pdf
    • http://keandkico.com/uploads/1/3/0/9/130969825/3326944.pdf
    • http://asinglesthought.com/uploads/1/3/0/6/130621404/a345352b2a.pdf
    • http://bloordaleblog.com/uploads/1/3/0/5/130590689/niwipokibuzabuki.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d2d.bin
4e1f1186f4e1fd69436752ae809439fd75421399ee9187c574222cbd542aeae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2D 3572 bytes
font_01_sfnt_off00009a4f.bin
9bcbd98822c0a30553b2d325ca0cfb3f3108e2e15191657f82f4166ab2ad5781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4F 8452 bytes

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