Malicious PDF — malware analysis report

Static analysis result for SHA-256 e023be21c6f434af…

MALICIOUS

PDF

72.6 KB Created: 2021-06-06 05:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fef9692f5b8e12f1b71379a923c5092 SHA-1: 39aef6b96272286f885bc240ef34d1818d6a39cc SHA-256: e023be21c6f434afd75f8fc869f8d874d01741e32f97b6bb88a9c23aa311f653
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution attempt. The document contains a mass of external links, with the primary suspicious URL being 'https://catamma.ru/pbw?utm_term=how+to+create+a+cd+cover+in+publisher', suggesting a link farm or redirection to malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://catamma.ru/pbw?utm_term=how+to+create+a+cd+cover+in+publisher
    • https://fizakilugoleji.weebly.com/uploads/1/3/1/4/131438405/5046fa7416c6.pdf
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/2722120.pdf
    • https://cdn-cms.f-static.net/uploads/4493578/normal_60234fe69f04a.pdf
    • https://vanevuzitikuge.weebly.com/uploads/1/3/4/5/134588875/mijigegupobizep.pdf
    • https://tafanoxuxirugo.weebly.com/uploads/1/3/5/3/135327873/acb81.pdf
    • https://kilogabofavelu.weebly.com/uploads/1/3/4/5/134589148/69246575d4.pdf
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/jodijevofo.pdf
    • https://zarenatufozif.weebly.com/uploads/1/3/4/6/134691537/9318783.pdf
    • https://kaboraze.weebly.com/uploads/1/3/4/6/134667384/659807.pdf
    • https://wejapunikiver.weebly.com/uploads/1/3/4/2/134266614/5588249.pdf
    • https://sixabizutobago.weebly.com/uploads/1/3/4/6/134613494/11907.pdf
    • https://salabupomisopef.weebly.com/uploads/1/3/4/6/134631393/keber.pdf
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/puvifumeteku.pdf
    • https://cdn-cms.f-static.net/uploads/4469126/normal_6044674a1691e.pdf
    • https://pojixaguwor.weebly.com/uploads/1/3/1/4/131453565/4e38620.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9eff73e0-a199-40c4-8682-b475a972f00a/lilizumax.pdf
    • https://uploads.strikinglycdn.com/files/c8ef141e-b77e-4bae-a1a3-b3c031ba699b/what_company_owns_epic_software.pdf
    • https://uploads.strikinglycdn.com/files/e0f50bff-e395-497b-80ca-5b837d07cad7/sources_eau_chaude_pays_basque.pdf
    • https://uploads.strikinglycdn.com/files/bc0e2c10-f88f-4c71-98b0-a1f39cb2c0c3/how_to_reset_mini_r56_service_light.pdf
    • https://uploads.strikinglycdn.com/files/8dadc670-f5ef-4f12-9c0e-3ca45fb8c841/texas_sales_tax_rate_2020.pdf
    • https://uploads.strikinglycdn.com/files/0ed309cc-d7b0-4a70-9f3e-9f2585860ae8/kirafuxogajozupoxinem.pdf
    • https://uploads.strikinglycdn.com/files/455e2ef7-98c7-4046-9aae-8b4f7ce0cbd3/1468456331.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_off0000df09.bin
db614716fd0d1414657917e94b0b5bab69d5e5ec871d9b09c1a5fd99b7b34318
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 5412 bytes
font_01_sfnt_off0000f178.bin
5c120ea4568fa1a52c1632bf7dab833134ae9d583d7d630c9163c11dcb98d736
pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 10328 bytes