Malicious PDF — malware analysis report

Static analysis result for SHA-256 65dfb0e518f471ed…

MALICIOUS

PDF

55.7 KB Created: 2020-05-13 21:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 75005e2336fabb798a03cd13d4b1a47e SHA-1: e4d1644c78c9daff58c97b3c778704eec4d68885 SHA-256: 65dfb0e518f471ed97810c40acbcc97c236216c3fea87380968cacdb73f37db8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also flagged this PDF as malicious. The embedded URLs suggest a link farm or SEO spam tactic, potentially used to distribute malicious content or engage in phishing. 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://clearhomeuk.com/uploads/1/3/0/5/130550818/130550818.html#vscode+formatter+c++
    • http://sportennis.net/uploads/1/3/0/7/130775734/dedetuso.pdf
    • http://studydominica.com/uploads/1/3/0/9/130969656/nulabalawe_depoxixasi_tupulaxuv.pdf
    • http://onertgroup.com/uploads/1/3/1/3/131379598/299a1a25.pdf
    • http://funtimesphotoboothdj.com/uploads/1/3/0/4/130476317/b554f2d802ac116.pdf
    • http://raijaliisakorpela.com/uploads/1/3/0/6/130621608/mekusu.pdf
    • http://drandrewlukaris.com/uploads/1/3/1/4/131409236/lebitor-nenigefipefevu.pdf
    • http://daylightresources.com/uploads/1/3/0/4/130488498/5901968.pdf
    • http://usedcarpetile.com/uploads/1/3/1/4/131483184/minabulituzup.pdf
    • http://idris-shah.com/uploads/1/3/0/2/130288310/7968522.pdf
    • http://eliwellsphotography.com/uploads/1/3/0/2/130272586/dofufev_wabuvikabonize_fimopazosom_gabuwawupeger.pdf
    • http://bellinfischer.de/uploads/1/3/0/7/130738712/846d7ddc4efa9.pdf
    • http://deliveredphotos.com/uploads/1/3/0/7/130740163/0c7b0.pdf
    • http://interiorlifestyle-tokyo2019.com/uploads/1/3/0/4/130476141/defujozawokunor-godozudufor.pdf
    • http://essentialoilscyprus.com/uploads/1/3/0/6/130604104/nujuzajuxufosu_gomefubep_ledokoreja_xurilemovil.pdf
    • http://cafe-aandehul.dk/uploads/1/3/0/6/130639411/22a03.pdf
    • http://legacyfamilyservicesok.org/uploads/1/3/1/4/131454106/9518499.pdf
    • http://vectorhomeservices.com/uploads/1/3/1/4/131483550/1515040.pdf
    • http://hmimmigration.com/uploads/1/3/1/4/131406435/demupuraxasowet.pdf
    • http://techmasterj.shop/uploads/1/3/0/5/130542853/mixewubosakojun_suporoni_gifakokakuw_zimetus.pdf
    • http://vickywong.me/uploads/1/3/0/7/130739584/kivoxelagotogo.pdf
    • http://stonescapecompanies.com/uploads/1/3/0/6/130604292/faa4f4d7.pdf
    • http://crafttyrelmarket.com/uploads/1/3/1/1/131163725/zaxobisuza.pdf
    • http://thepostgradproject.com/uploads/1/3/1/4/131411600/sugagagutipos.pdf
    • http://worstcasesolutions.net/uploads/1/3/0/2/130271004/3f2d2b8fe5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068a2.bin
5e513dc00deb3f55fe3af4417e378744ada0a7e36c98fb52a852f39d61e926da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A2 20568 bytes
font_01_sfnt_off0000aad7.bin
732da31aa1368ef33acd8c82ed015306bf1682ff67c32107f3f876f50279c951		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD7 11564 bytes

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