Malicious PDF — malware analysis report

Static analysis result for SHA-256 408da8dcacb067c3…

MALICIOUS

PDF

82.5 KB Created: 2020-03-08 02:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2723dd1fac40ac0066a060ff78ad072a SHA-1: 1fd9ce40d4f0886df14943c8d3e663d745f5ff12 SHA-256: 408da8dcacb067c3150bdbf3dd2cc3d7f1ef9185700d20dbbf8d22d963f888ef
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many with numeric or slug-based slugs, indicating a link farm or SEO spam tactic. One prominent link points to a page discussing Acer laptop graphics cards, suggesting a lure to attract users interested in tech hardware. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dedicated-17.pleasingfood.com/uploads/1/3/0/8/130815311/130815311.html#acer+aspire+one+d250+graphics+card
    • http://grupovianna.com/uploads/1/3/0/5/130550833/lubumojo-vumite-zevoremononi-biwoz.pdf
    • http://mygprf.org/uploads/1/3/0/6/130603842/jilimimaxamebuw-dulixire-benunoron-kavarawexelija.pdf
    • http://painsufferersspeak.com/uploads/1/3/0/6/130604361/gevofe_mulugebigarorur_nakonugejevafid_kipupog.pdf
    • http://tinarazzitheartist.com/uploads/1/3/0/4/130476104/kikup.pdf
    • http://affordablevinylrepair.com/uploads/1/3/0/2/130272511/luvasebufedi_wexalalaj_mupilozir.pdf
    • http://makscreations.org/uploads/1/3/0/8/130814173/e2c748a52.pdf
    • http://thanks.republican/uploads/1/3/0/7/130738978/bodipowi-nubewuruwuvi.pdf
    • http://thelastanalogs.com/uploads/1/3/0/5/130588511/pulijef_xobukiz_sokekuxexe.pdf
    • http://www.northernlightsrescue.org/uploads/1/3/0/7/130776055/f00ec.pdf
    • http://www.rosebudvictoria.com/uploads/1/3/0/5/130551241/sapugejuzenopezo.pdf
    • http://www.rpskillsunlimited.com/uploads/1/3/0/5/130589158/rigukodorirowem_fakipiweketurel_jenurizu_nisalafunujotol.pdf
    • http://74-123-75-24.mgwnet.com/uploads/1/3/0/2/130272240/pewenozoxidisa.pdf
    • http://laextraordinaire.com/uploads/1/3/0/5/130588417/9294c85c4e0a297.pdf
    • http://www.siobhans.space/uploads/1/3/0/6/130604529/tawowel.pdf
    • http://www.1993422877.com/uploads/1/3/0/2/130287527/7346533.pdf
    • http://hostmaster.hostmaster.hifivintageitaly.com/uploads/1/3/0/4/130483879/kimosivaw-texavuvowusufuz-padivomoxugix.pdf
    • http://vaneiger.com/uploads/1/3/0/7/130739363/gumomaf_wawixa.pdf
    • http://taocostarica.com/uploads/1/3/0/7/130776213/5511473.pdf
    • http://encyclopediasonica.com/uploads/1/3/0/7/130775985/4751dc4851.pdf
    • http://hooplajewels.net/uploads/1/3/0/8/130874297/tereme_widufoxetadesem_vexawag_vulosenok.pdf
    • http://mortgageskout.com/uploads/1/3/0/6/130639613/jipozefejo.pdf
    • http://naftakw.com/uploads/1/3/0/5/130588983/jabapotinax.pdf
    • http://providence-title.com/uploads/1/3/0/4/130476981/0019e1258c90.pdf
    • http://qijidaoyin.net/uploads/1/3/0/7/130775958/9584399.pdf
    • http://www.interiordesignlara.com/uploads/1/3/0/7/130738615/vasilibimuk.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_off00011731.bin
887156254fe84b28d1eed49540821805f70ac7f2434f36179cc3dcf497227bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11731 9612 bytes

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