Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ea33880b218389…

MALICIOUS

PDF

39.8 KB Created: 2020-04-02 02:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0924df91dead8176f331292674901a23 SHA-1: ec7cbe6a3323de974a775def261f48902536a954 SHA-256: 19ea33880b218389c4d110d64431049b12338826686dbe824d2185f87c9dad25
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a large number of external links, identified as a PDF link farm. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'Examenes para sexto grado de matematicas' and references wkhtmltopdf, suggesting a lure document. The primary attack pattern involves redirecting users to numerous external URLs, likely for SEO spam or to host further malicious 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://afaparents.org/uploads/1/3/0/6/130605229/130605229.html#examenes+para+sexto+grado+de+matematicas
    • http://millcreekbeef.com/uploads/1/3/0/6/130604288/11d5bef4345bb8.pdf
    • http://blushlaboutique.com/uploads/1/3/1/4/131406629/sazamixave.pdf
    • http://jamiemarkbruunpainting.com/uploads/1/3/0/4/130483703/4592247.pdf
    • http://cocorayefit.com/uploads/1/3/0/6/130604141/545d5.pdf
    • http://invest-mongolia.mn/uploads/1/3/0/9/130969647/pemav_xinuna_xukurije_fizoxiwen.pdf
    • http://bighousesscotborders.org/uploads/1/3/0/7/130775440/luzakezuxezopu_gojekoteve_kesuxopibumo_sevupow.pdf
    • http://crimsonshadowpack.com/uploads/1/3/0/9/130968942/kaxonevemenodarij.pdf
    • http://robosail.org/uploads/1/3/0/7/130775294/a10b06ec.pdf
    • http://choclity.com/uploads/1/3/0/6/130605240/9057947.pdf
    • http://visitwanganella.com/uploads/1/3/1/3/131379946/kojipezopov-guxolivi.pdf
    • http://walkingmountain.net/uploads/1/3/0/4/130489162/bopigefelesukufig.pdf
    • http://corona-towingservice.com/uploads/1/3/0/4/130435726/bodipajado.pdf
    • http://augustahousekeeping.com/uploads/1/3/0/9/130969012/dd580d8.pdf
    • http://safecleanasc.com/uploads/1/3/1/4/131406781/020416e.pdf
    • http://qualitymenshaircare.com/uploads/1/3/0/3/130313115/totasomarus.pdf
    • http://leadtheway394.org/uploads/1/3/0/2/130288391/90f570cde29.pdf
    • http://artistjacquespepin.com/uploads/1/3/1/3/131384249/4694138.pdf
    • http://chicconsultants.com/uploads/1/3/0/5/130539756/682d69b8.pdf
    • http://isaacbarrios.com/uploads/1/3/0/3/130313585/kitavasepe_pafedezezifu.pdf
    • http://chrispends.com/uploads/1/3/0/8/130813652/vabel.pdf
    • http://huabba.de/uploads/1/3/0/4/130477287/xeripofajixefu_bebiwemop_pojanotup_venewef.pdf
    • http://myslipperstravel.com/uploads/1/3/1/3/131398156/8175432.pdf
    • http://www.comprensivocigliano.it/uploads/1/3/0/2/130273791/fiwalivev-vawibife.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_off00007181.bin
bcbea48850031237f312dae3346c0d8d05a87085f26b78c71fb51176beb89e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7181 8724 bytes

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