Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe71ffed92e5f6a…

MALICIOUS

PDF

42.9 KB Created: 2020-03-12 06:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0cf4a491521d465f7767c8182a6b193b SHA-1: c924e3eaef57f3a94437c18147da7781a3be8367 SHA-256: 8fe71ffed92e5f6a7f4e1dabf4dd3a09200a37118f3c85a54a19a325fd248575
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO abuse tactic. The document body, though partially corrupted, contains text related to medical treatment and the authoring application, which is likely a lure to encourage users to click on the embedded malicious URLs. The ML classifier strongly indicates maliciousness.

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://sdrvowners.org/uploads/1/3/0/8/130874398/130874398.html#proliferative+diabetic+retinopathy+treatment
    • http://davidhurleyfilms.com/uploads/1/3/0/7/130739034/nukeronajer-zozajotut-kumuzome.pdf
    • http://mykidsnetwork.com/uploads/1/3/0/7/130775023/617d4.pdf
    • http://babyphotons.com/uploads/1/3/0/5/130540296/9edbd.pdf
    • http://nc-zeitgeist-foundation.org/uploads/1/3/0/3/130379514/8654182.pdf
    • http://ay-kay.com/uploads/1/3/0/5/130588977/67e89647d995cbd.pdf
    • http://alamedahometeam.org/uploads/1/3/0/2/130270879/6296326.pdf
    • http://yq-wine.com/uploads/1/3/0/6/130639535/bilulun.pdf
    • http://modernhomebuyers.us/uploads/1/3/0/8/130814672/3232c0c3d.pdf
    • http://www.mdtinc.net/uploads/1/3/0/8/130874164/kutiduga_sudazolo.pdf
    • http://kmajzoub.com/uploads/1/3/0/7/130739094/moxogolakotofu.pdf
    • http://themezuzahcentre.co.uk/uploads/1/3/0/9/130968958/bituzuxijufu_morudalaxofi_jixubesijaluba.pdf
    • http://unfinishedcollective.com/uploads/1/3/0/6/130620314/gimexuzokiruti.pdf
    • http://globalcompetence4educators.com/uploads/1/3/0/2/130272587/rudawoleg.pdf
    • http://socreation.fr/uploads/1/3/0/3/130379246/0fd703c8f0066b.pdf
    • http://www.bgraceart.com/uploads/1/3/0/6/130639662/sozanipa.pdf
    • http://steamplayground.org/uploads/1/3/0/2/130288421/rogedumasiwar-nasodafuwuru-lipupogorodi.pdf
    • http://odessahomeinspection.com/uploads/1/3/0/8/130813398/237706.pdf
    • http://kbeconstructionservices.com/uploads/1/3/0/5/130551050/mufiwufizeze_vexig_gegewovok.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_off00007ec1.bin
117fa154a365bbe5ef01aaf3cf15114576be747786f3a7720253aa3769456f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC1 8120 bytes

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