Malicious PDF — malware analysis report

Static analysis result for SHA-256 a136c4e35cd736b4…

MALICIOUS

PDF

78.2 KB Created: 2021-03-17 23:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 897b40ee9b2202397c861eea6c1dc19f SHA-1: 258655793c0e2198bb17ed84fd8030a43e2b55e7 SHA-256: a136c4e35cd736b45ef8c25b2d382270ca31125a1a08d66ef76fc5545538db90
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The embedded URLs point to various domains, likely serving as lures or redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://pelibifir.ru/wix?keyword=craigslist+columbus+general
    • https://cdn-cms.f-static.net/uploads/4386836/normal_6047a71ddfe66.pdf
    • http://sefexetewizu.iblogger.org/rasiki.pdf
    • http://idealica-ordina.site/ravetexakawapojmaz6u.pdf
    • https://cdn.sqhk.co/jujadiziga/ijhhFhh/bulakugivavavoti.pdf
    • https://cdn.sqhk.co/wimiwupo/Siiibg8/wallpaper_hd_neon_primer.pdf
    • https://sijotifibiga.weebly.com/uploads/1/3/0/9/130969940/lulewe_relutabatev_wuvamemalajimuk.pdf
    • https://cdn.sqhk.co/ralapogifur/zjaodz9/27710672006.pdf
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/negawekuzelu.pdf
    • https://jenajurowob.weebly.com/uploads/1/3/1/4/131408252/361538.pdf
    • https://static.s123-cdn-static.com/uploads/4471512/normal_5fe1a776d24d3.pdf
    • https://molukubiluvu.weebly.com/uploads/1/3/1/4/131453067/narupoxis.pdf
    • https://cdn-cms.f-static.net/uploads/4462352/normal_60432fbf66568.pdf
    • https://cdn-cms.f-static.net/uploads/4447436/normal_603f67c58123d.pdf
    • http://spacexfoundation.net/visual_studio_2015_professional_license_keyppayp.pdf
    • http://goromeo.club/covid_vaccine_bells_palsy_side_effects_cdc2974y.pdf
    • https://cdn.sqhk.co/pixafosabow/h5gjgev/gojemokejubutavumotaju.pdf
    • http://tk-pobeda.site/10274441697piedr.pdf
    • https://tusigidufamem.weebly.com/uploads/1/3/5/3/135350313/seveva.pdf
    • https://cdn.sqhk.co/tifesiwafo/AahfJhf/82095191979.pdf
    • https://cdn.sqhk.co/zepigelona/agdUhid/v_azarenka_tennis_ranking.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://womilebejip.rf.gd/gevolowusavujudusa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d4.bin
3c989fd43b80c72c34179c90eca797a4bb112cb8aee85d896dd85b47e97dda83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 5164 bytes
font_01_sfnt_off0001064c.bin
05ec33850de2d09dd5416b81ed72ac644afc7913e9f00bf52d5062b03ff014a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 10804 bytes

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