Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cb9d9631ba3916…

MALICIOUS

PDF

36.7 KB Created: 2020-03-21 16:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f6c6ee7c64a079b0850b0747370deed3 SHA-1: ed7e2b42e58e5fcc158e76b95f3f89742200fe5e SHA-256: c4cb9d9631ba39164b2317cbfef6dddca41fcc53d5c2a4ff7f10fc57dd4e5958
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The embedded document body text, though partially corrupted, contains references to the URLs, suggesting a link farm or redirection scheme designed to lead users to potentially malicious content hosted on numerous domains.

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://kelbels.org/uploads/1/3/0/8/130814279/130814279.html#libro+juguemos+a+leer+y+escribir+en+pdf
    • http://offshorefishingseq.com/uploads/1/3/0/2/130289424/pumotizazi.pdf
    • http://www.marrakech-guided-tours.com/uploads/1/3/0/7/130775557/wovabo.pdf
    • http://theconductormusic.com/uploads/1/3/0/5/130590456/kijugaxu.pdf
    • http://developmentaleditors.com/uploads/1/3/0/5/130589354/safuviv.pdf
    • http://radtacular.net/uploads/1/3/0/7/130776787/fileruv.pdf
    • http://kramerius.qbizm.cz/uploads/1/3/0/5/130590672/xipurabagepil.pdf
    • http://tjentcorp.com/uploads/1/3/0/4/130435846/7750460.pdf
    • http://experienceyourdreamstravel.com/uploads/1/3/0/5/130590531/bavaveni.pdf
    • http://treeservicechulavista.com/uploads/1/3/0/4/130436188/020017.pdf
    • http://journeyinfaithst-lukeslebanon.org/uploads/1/3/0/5/130547659/8680431.pdf
    • http://merakihealing.org/uploads/1/3/0/5/130542718/3213177.pdf
    • http://www.garrett-kay.com/uploads/1/3/0/7/130738850/murowojaxuj.pdf
    • http://sermonaudiosource.com/uploads/1/3/0/7/130740055/fogekopose.pdf
    • http://multiserviceliscasllc.com/uploads/1/3/0/6/130639061/wefolob_lexexemux_tatetuxekot_rabakipudijube.pdf
    • http://connectivetissueissues.com/uploads/1/3/0/7/130739416/ca5309.pdf
    • http://www.joshgingold.com/uploads/1/3/0/5/130545189/vudupevu_xulegapofi.pdf
    • http://whereismyeraser.com/uploads/1/3/0/6/130621897/zapopa-zajifosakoza-sofodutuviju.pdf
    • http://www.cherryhilllawncare.com/uploads/1/3/0/6/130620217/fujom_sosufip.pdf
    • http://resibuenasvibras.com/uploads/1/3/0/4/130490117/golagoxogimiwaz.pdf
    • http://cfthomas.com/uploads/1/3/0/5/130551505/vepin_kojexagi_mivexot_lonerowukitodi.pdf
    • http://travellingtreasureboxes.com/uploads/1/3/0/8/130874282/bba0f383766b48.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_off000065d8.bin
7a603ce8562d7010229442e777e4dfa321b157b1adec334b0b85912b5b4a0631		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D8 8016 bytes

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