Malicious PDF — malware analysis report

Static analysis result for SHA-256 730ba36f9f7cc921…

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 00:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6dc688c3418f3c13621ce4c6de1c735 SHA-1: d11315632dd2934b3d5f81c854984f767a8d2fe2 SHA-256: 730ba36f9f7cc921bccc01b9295630e00ad8118fee55129781b26f0e94341de6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'answer key grade 8', which is likely a lure. The presence of ClamAV and ML heuristic firings further confirms its malicious nature, with the primary goal appearing to be directing users to malicious external sites.

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://mezovuduw.ru/wix?keyword=science+fusion+answer+key+grade+8
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/90712.pdf
    • http://mavito.online/gugorogulogazozrc06.pdf
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/5901583.pdf
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/303afe316f4b.pdf
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fdd88e3b4ac0.pdf
    • http://bamefidev.mygamesonline.org/ravap.pdf
    • https://static.s123-cdn-static.com/uploads/4409114/normal_5fc5952258a32.pdf
    • http://zdorovie-vashe-vse.xyz/glacier_bay_2_handle_kitchen_faucet_repairl3dql.pdf
    • https://static.s123-cdn-static.com/uploads/4413719/normal_5fc892ff26131.pdf
    • http://counterman.ru/791246753744o7vc.pdf
    • http://xesapuwax.mywebcommunity.org/zonusuvot.pdf
    • http://reduslim-italiaufficiale.site/sans_20_critical_controlsw3qgt.pdf
    • http://copyrightram.net/bifumesuvod564bp.pdf
    • http://pibarulajido.getenjoyment.net/64169957043.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suruliloxapesas.myartsonline.com/abul_kalam_azad_books_free_download.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_5ccbae1e94da4f7c8885783e74955c71.pdf?index=true
    • http://gupatevefojip.myartsonline.com/deontology_stephen_darwall.pdf
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_bb95b3d46a704b9b82ea757775589bcf.pdf?index=true
    • http://pozidijapepore.atwebpages.com/44695494903.pdf
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_8c80c82335fa4f0aae62923ca5b785d8.pdf?index=true
    • http://gekolutewubel.myartsonline.com/mototijupuwekeg.pdf
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_ec2473731c0f4afe83df6254b10df7e9.pdf?index=true
    • 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_off0000e4f5.bin
6a572049fd09f0d76910b2442c3fcd4b639d9f48727e7cc3e212f0ce179d259f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 5712 bytes
font_01_sfnt_off0000f897.bin
e868526fda145cd39ca3b143eca1db2a39d4f1e5f90a49a0c35c88172c4c6356		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 11988 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.