Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae974cf623cba85d…

MALICIOUS

PDF

85.2 KB Created: 2021-03-09 18:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d97332a502b2b86197232acb30aca037 SHA-1: 5328498d38d380607d457ea770976f72c7bbfc22 SHA-256: ae974cf623cba85d8bef56d84177583d9bafcb432533e47f84535486134c84ca
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/aws?utm_term=daily+schedule+for+a+2+year+old+and+newborn PDF link annotation
    • http://sesopuligu.iblogger.org/38883408148.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/bijHgjp/27005760327.pdfIn PDF document text
    • https://xiluruzubu.weebly.com/uploads/1/3/0/8/130813732/wegiloxisan.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/davigujufagufeji.pdfIn PDF document text
    • https://nerukime.weebly.com/uploads/1/3/1/3/131379394/sawebewav_vomiwovamemupap.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuvikadob/dMWUgiM/senigupezevupupan.pdfIn PDF document text
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/8345197.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_0671744f1977411cb9137a551c1a890c.pdf?index=trueIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_31096a207dc245b789f51a3e6294a1ec.pdf?index=trueIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_6ea6757d3d04479fa66d6dd6767d04a8.pdf?index=trueIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_8b1edef87141454aaee1ad8e733c956a.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_445d19770a2942c2957de387482e1d77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/formal_letter_writing_application_for_leave.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_41d45d905dfe421b8705e00d7c058c48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/cuando_es_una_yarda_en_metros.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_e62f553ef3224a58bd9ef5882f1b56cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazutun/98820340328.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/english_tests_5th_grade_worksheet.pdfIn PDF document text
    • http://detotoga.epizy.com/kubifenesiviv.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_596ab2410d8048eaa04f11e4b751313a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vasofirida/mubeseluf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 5376 bytes
SHA-256: 1f40bb8cecc3af4dc14d61eb5793f233d219aaf06a504c2d19ea83453e856b0f
font_01_sfnt_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 10844 bytes
SHA-256: dc1039b5d09596682a0207f1a76ec58589d4a460fe0424b3af1004ff820a7919
font_02_sfnt_off00013918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13918 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333