Malicious PDF — malware analysis report

Static analysis result for SHA-256 2077c23b96b05f52…

MALICIOUS

PDF

89.7 KB Created: 2020-03-22 14:16:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1ab73e711034a7bada3a53096171ccaa SHA-1: bab7503e96594aae93fdb1628c81a8bb722f2715 SHA-256: 2077c23b96b05f52f675c1eec4d65cb80701f9b2a63f82c92458c1825471c1fe
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 User Execution

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text related to English idioms, which appears to be a lure to disguise the malicious intent of linking to numerous external PDF files. The primary attack pattern involves directing users to a vast network of linked PDFs, likely for SEO spam or to host further malicious content.

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://michaelhiggins.ie/uploads/1/3/1/0/131070827/131070827.html#examples+of+idioms+in+english+language
    • http://songofthelarkmusicforthesoul.com/uploads/1/3/0/7/130739061/nejisilagab.pdf
    • http://discountaircraftparts.com/uploads/1/3/0/2/130288802/6910036.pdf
    • http://37591.atkhn.com/uploads/1/3/0/6/130639445/4a45cd7acc6c3.pdf
    • http://editor.pictures/uploads/1/3/0/4/130483178/lanibilorejevuk-zadomugot-laxesotazotix.pdf
    • http://www.nakomagraeagle.com/uploads/1/3/0/5/130538995/35ce1.pdf
    • http://sayvoz.com/uploads/1/3/0/4/130483043/1ae51.pdf
    • http://ashwelljewellery.co.uk/uploads/1/3/0/5/130589124/8145883ea70303.pdf
    • http://robertsoncountycare.org/uploads/1/3/0/6/130604685/vukemaxumiw.pdf
    • http://chongai520.com/uploads/1/3/0/2/130291996/kuzazalitufuxu_fojoxirigitidij.pdf
    • http://eskidesigns.biz/uploads/1/3/0/5/130543685/8373563.pdf
    • http://www.burglarandcctvoxford.co.uk/uploads/1/3/0/7/130775138/6c4ff.pdf
    • http://www.classiccoffee.shop/uploads/1/3/0/7/130739684/4f742a881.pdf
    • http://konikkita.com/uploads/1/3/0/6/130639083/dasojure.pdf
    • http://www.remote.splitrockassociates.com/uploads/1/3/0/7/130775755/6a99d94909.pdf
    • http://www.kathleensgardenllc.com/uploads/1/3/0/4/130489131/benirataburakaz.pdf
    • http://bakersfieldcasasnuevas.com/uploads/1/3/0/6/130604150/f37a5f7f83.pdf
    • http://doverashop.com/uploads/1/3/0/6/130605517/5607916.pdf
    • http://theinsuranceguy.agency/uploads/1/3/1/0/131070167/lerezisosekedagoxa.pdf
    • http://burnband.net/uploads/1/3/0/8/130874023/sumipo_gadafoxes.pdf
    • http://hostmaster.harrytarot.com/uploads/1/3/0/4/130488172/7345719.pdf
    • http://servantsheartseniorcare.com/uploads/1/3/0/6/130621334/gopokonigin_ruvot.pdf
    • http://www.shopsaltwatersweethearts.com/uploads/1/3/0/6/130621785/rawekitilirij-febur-nefalumivu-wirav.pdf
    • http://mylittlerugratshomechildcare.com/uploads/1/3/0/6/130639272/pogipi.pdf
    • http://bedonetmarmaille.com/uploads/1/3/0/7/130739897/pavoxu_wabajoz_guzimikam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122f1.bin
ab2540888422b8e24fe4d5b94892e63909602d220c76e34eb797e184d1d35481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 8624 bytes
font_01_sfnt_off00014395.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14395 16036 bytes

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