Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a71d9ac7492bc27…

MALICIOUS

PDF

38.9 KB Created: 2020-05-18 03:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b7ae37f3319f61f6bd85e0da682598e SHA-1: 8e7f616f79146ce734ead584ebb56ff4fe7a990c SHA-256: 0a71d9ac7492bc27a006fc8bf8a9582a179c2dfe37e74e0093be828daaca408e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a Search Engine Optimization (SEO) manipulation tactic or a distribution point for further malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external URLs points to a likely intent to redirect users to potentially harmful sites.

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://starryeyes.org/uploads/1/3/0/2/130273801/130273801.html#caslon+rounded+font
    • http://calvaryyakima.org/uploads/1/3/1/0/131070571/4321778.pdf
    • http://citizensforpositivechange.org/uploads/1/3/0/2/130289431/3979d5b9c.pdf
    • http://crownwife.com/uploads/1/3/0/7/130775610/1bbbe85491.pdf
    • http://nvui.org/uploads/1/3/0/7/130775490/d27081d09e1939.pdf
    • http://mesquitesitting.com/uploads/1/3/1/3/131379541/4e109697f647c7.pdf
    • http://amazingscentsco.com/uploads/1/3/1/6/131636745/2d06e36d65e1.pdf
    • http://thenodramamamas.com/uploads/1/3/0/2/130289254/1f3df6fc062359d.pdf
    • http://captiveminds.net/uploads/1/3/0/8/130874038/dosew_kugonetos_tevomurogi.pdf
    • http://allisemy.com/uploads/1/3/1/4/131455024/rurafu_nefotubidako_fevakepulum_zesivarimina.pdf
    • http://vediskastrologi.dk/uploads/1/3/1/4/131407096/lopusuzokovebad.pdf
    • http://laughterpieces.com/uploads/1/3/1/4/131409264/sixuronufegukusuri.pdf
    • http://virile.media/uploads/1/3/1/3/131380087/pitawusodojoku.pdf
    • http://oasismassagemckinney.com/uploads/1/3/1/6/131606965/5170101.pdf
    • http://authenticmystory.com/uploads/1/3/0/3/130323417/sotunawomidugu_zawovevek_lagij_juwaxasun.pdf
    • http://orthodontic-continuing-education.com/uploads/1/3/1/3/131398064/bidulazejuri-xamizu.pdf
    • http://jandgwarehousing.com/uploads/1/3/0/3/130379462/lebopogu-bolesufipuzive.pdf
    • http://sirwaddlesworths.com/uploads/1/3/1/4/131453682/5b49e.pdf
    • http://soundspelling.xyz/uploads/1/3/0/7/130775195/reduwufup_kizipov_paxifike_seliribagita.pdf
    • http://eclipse-dogtreats.com/uploads/1/3/0/5/130551319/pajaguwokir.pdf
    • http://greenkuchel.com/uploads/1/3/1/3/131380297/tapopub.pdf
    • http://dmbdistributors.com/uploads/1/3/0/4/130489168/zifejegirokexe-gofesuza.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006727.bin
2282f50d83d64e8ec4105d179abc305259e56a927cc57ed70921596481b4c428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6727 12344 bytes

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