Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58d9bd771d91c20…

MALICIOUS

PDF

71.1 KB Created: 2021-02-15 08:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b02e14702eb46d0e5ac7ccc237bad3b SHA-1: 2b92877daa8ce8155bfdc2e970f134ec527d9d07 SHA-256: b58d9bd771d91c20d76368caab5ba5a69cce85714a9ffc765f648ad1c67d8a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files hosted on different domains. This suggests a tactic to distribute content or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=kindergarten+curriculum+pacing+guide
    • http://idealica-it.website/nimuzapowumojefijemxetqc.pdf
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/26b991ce9cc460.pdf
    • https://static.s123-cdn-static.com/uploads/4465386/normal_6000ec57a65a5.pdf
    • https://cdn.sqhk.co/tajiwikiter/icFiaib/ping_pong_table_walmart.pdf
    • https://rowevopa.weebly.com/uploads/1/3/1/8/131872281/5054451.pdf
    • https://cdn-cms.f-static.net/uploads/4369656/normal_60182ff15ef90.pdf
    • http://snail-case.store/8._snf_matematik_olimpiyat_sorular2dk9w.pdf
    • http://healthytrands.com/91826881876puamr.pdf
    • https://cdn-cms.f-static.net/uploads/4372963/normal_600b5588595a6.pdf
    • https://static.s123-cdn-static.com/uploads/4452199/normal_5fcf1c1d431c2.pdf
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/938806.pdf
    • http://copyrightsupport-ig.com/xajobovl16ga.pdf
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5ffdcc658d21d.pdf
    • https://pukutititoj.weebly.com/uploads/1/3/1/3/131383613/2034541.pdf
    • https://cdn.sqhk.co/pabulibig/ibjgNNk/spinning_farm_animal_noise_toy.pdf
    • https://static.s123-cdn-static.com/uploads/4459164/normal_5ffe1e0fae5ad.pdf
    • http://wide-mean.top/civ_6_rise_and_fall_england_guideksc0t.pdf
    • https://static.s123-cdn-static.com/uploads/4367937/normal_5fe06162ec2d8.pdf
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5fc684986f626.pdf
    • http://gratoram.site/turilotuzumovoiszdu.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_off0000d614.bin
032e5e665f5531918405e7904b5b445b245a5eca9a3065bf29ccfd4e3d01127d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 5184 bytes
font_01_sfnt_off0000e7a8.bin
977a4a57e407b2e09a0138938a452afc083c1d4eaad62fc3e7bba706451ce7ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 12336 bytes

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