Malicious PDF — malware analysis report

Static analysis result for SHA-256 450b59b82218530c…

MALICIOUS

PDF

39.8 KB Created: 2020-03-22 02:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed0cae43eb1c5d9f9a145bb999370235 SHA-1: a7334fa62f82d74406d04e514272fa9c62ce7e20 SHA-256: 450b59b82218530cd2187d71bdefda7106081300292a7802e5dd86d7bf2893d3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to various domains, a technique often used for SEO spam or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the title 'Ejercicios de inyectiva sobreyectiva y biyectiva resueltos' and metadata indicating it was generated by wkhtmltopdf, suggesting a potential lure for users interested in mathematical exercises, which then redirects to a link farm.

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://vintageslim.com/uploads/1/3/0/2/130291471/130291471.html#ejercicios+de+inyectiva+sobreyectiva+y+biyectiva+resueltos
    • http://elvinanderwinstea.com/uploads/1/3/1/0/131069839/biromug-forulariguzol-tarimitugulimik.pdf
    • http://www.oregonizdlivingtoday.com/uploads/1/3/0/5/130551335/torinepibibu.pdf
    • http://www.ngochuyenmusic.net/uploads/1/3/0/7/130776535/59b870f2.pdf
    • http://americanoffroadnv.com/uploads/1/3/0/5/130588867/votumabuf.pdf
    • http://www.poppyandrose.co.uk/uploads/1/3/0/4/130475938/fivuripo.pdf
    • http://themarkstaging.com/uploads/1/3/0/6/130620594/kuwuditonidodikegaw.pdf
    • http://hostmaster.breconcarsales.co.uk/uploads/1/3/0/5/130541133/babovisone-fewasid-finivepirokeg-birusa.pdf
    • http://fatsom.com/uploads/1/3/0/2/130273788/c66ce572d4bde.pdf
    • http://nexts-lab.com/uploads/1/3/0/5/130590416/5735884.pdf
    • http://vuwwib.com/uploads/1/3/0/9/130969699/56be1a6db8afdc4.pdf
    • http://retailcoupons.ru/uploads/1/3/0/6/130622104/5475534.pdf
    • http://hightechinternational.org/uploads/1/3/0/5/130550961/xegijiwu_peluxopanat_noperik.pdf
    • http://www.sassyscraps.com.au/uploads/1/3/0/5/130588334/wazipajamiku-deguvuzalijajo-pizevu-mijofumelete.pdf
    • http://botaniespa.com/uploads/1/3/0/3/130379291/sizobabu-dobetif-kezivaxa-vevefiwezagalaj.pdf
    • http://thebrittnyebee.com/uploads/1/3/0/9/130969991/5a6590b812b.pdf
    • http://millerjohnsonmedia.com/uploads/1/3/0/2/130271017/f87ec187f.pdf
    • http://drivebarnett.com/uploads/1/3/0/6/130604527/4c96bf5f0b90a0.pdf
    • http://reedsolar.com/uploads/1/3/0/4/130483299/pujabuxugaxe.pdf
    • http://joycrownedproducts.com/uploads/1/3/0/7/130738739/memadexup.pdf
    • http://fastandfurifest.org/uploads/1/3/0/4/130476432/vuzuso_dubatisupobavim_vogifexa.pdf
    • http://bosslessforever.com/uploads/1/3/0/5/130543074/2505065.pdf
    • http://recipework.com/uploads/1/3/0/4/130475909/worakaranijara.pdf
    • http://nshoilpurifier.com/uploads/1/3/0/5/130588560/cffbaabb67.pdf
    • http://recipework.com/uploads/1/3/0/4/130475909/wora
    • 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_off00006f60.bin
8b25f3d04df5f0a74d1f8fa5fedd98401d218279693f980c71264bfd0510a9b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F60 8616 bytes

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