Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b961d79834e2a2d…

MALICIOUS

PDF

48.2 KB Created: 2020-04-01 20:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: feb88671e4f48eb180aa592e353ca470 SHA-1: 7369d66d781599547f7446c79b299852c1fa4dae SHA-256: 6b961d79834e2a2de51be54425ccb7f4357792adba90801d69e348d246619fdf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on different domains. This technique is often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports this assessment.

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://wordsmith-sg.com/uploads/1/3/0/8/130814993/130814993.html#binary+arithmetic+using+1%27s+and+2%27s+complement
    • http://lmminet.com/uploads/1/3/0/5/130544898/jijopiz_rujalibutimote_lixaniwogesaxut.pdf
    • http://foundationschurchwilliamsburg.com/uploads/1/3/0/7/130776726/suduzaf.pdf
    • http://stephensonfinancialservices.com/uploads/1/3/0/4/130435962/zewoluwelovola-kolof-jegurupi.pdf
    • http://pypexhibition.com/uploads/1/3/0/6/130621989/xotutisuvesofati.pdf
    • http://molecularanalysis.org/uploads/1/3/0/7/130740209/popijusojuzaga_dizadatemes.pdf
    • http://plusconsulting.org/uploads/1/3/0/5/130540420/sepabazubarilawij.pdf
    • http://agirlfromodisha.com/uploads/1/3/0/5/130540406/zudumefomox_veweziwutif.pdf
    • http://michaelvincentmagic.com/uploads/1/3/1/3/131379639/829d7131.pdf
    • http://hypnosispaloalto.com/uploads/1/3/0/6/130620575/sebifuvibanexufakute.pdf
    • http://planetswim-asia.com/uploads/1/3/0/4/130488885/4991553.pdf
    • http://townhousemarketinggroup.com/uploads/1/3/1/4/131407705/5163190.pdf
    • http://nosquito.de/uploads/1/3/0/4/130483871/48fec8d72739.pdf
    • http://moreland-motivation.com/uploads/1/3/0/6/130639815/4147008.pdf
    • http://sabahhomestaykualapenyu.com/uploads/1/3/1/0/131069923/6029010.pdf
    • http://stgeorgelocksmithsi.com/uploads/1/3/0/5/130543653/4119852.pdf
    • http://thedeppens.com/uploads/1/3/0/6/130604500/kolodalovozerexan.pdf
    • http://fahrenheit452.org/uploads/1/3/0/5/130590295/vepemorebesaxi_xavoke.pdf
    • http://doggleggmedia.com/uploads/1/3/0/2/130271153/430d5.pdf
    • http://orovalleymassage.com/uploads/1/3/0/6/130621063/wawivigutalekoro.pdf
    • http://ajluxarts.com/uploads/1/3/0/7/130776228/wilaxixifeforalife.pdf
    • http://gmbell.com/uploads/1/3/0/2/130291939/599070.pdf
    • http://compasspublishing.org/uploads/1/3/0/6/130603995/d6bb730dd00c.pdf
    • http://theappalachianfarmhouse.com/uploads/1/3/0/5/130545485/rolewojazibola-lapesijig.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007309.bin
d56bf1f761725c0292689687b0fc457a7fbfec222c478e80fa14c59590bdbe89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7309 7904 bytes
font_01_sfnt_off000091c3.bin
63f5e27ee3d24cc00d413e59c301cc73ab377383609796993547673f2bea898c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C3 2600 bytes
font_02_sfnt_off00009aef.bin
f19dc41d490b60033b52f2fdde74623f1ba9924597607807c173cf149651756c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEF 16060 bytes

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