Malicious PDF — malware analysis report

Static analysis result for SHA-256 c441be35260b5baf…

MALICIOUS

PDF

77.9 KB Created: 2021-03-21 23:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0a9e1e57ff6e986321a2098e22d129c8 SHA-1: bce51ae55b71218f18fb68422595d8b9472a7715 SHA-256: c441be35260b5bafb35ea5b47cafb48808c21dfed9cc0b036808c02986874ebc
156 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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/strik?utm_term=all+the+birds+in+the+sky+book+review PDF link annotation
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/fagapijo.pdfIn PDF document text
    • https://koreluluzoma.weebly.com/uploads/1/3/5/9/135972167/e6eff480.pdfIn PDF document text
    • https://pevomoten.weebly.com/uploads/1/3/4/6/134626000/lusejetupi.pdfIn PDF document text
    • https://voromelub.weebly.com/uploads/1/3/4/8/134872571/1632457.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/gFgcAwi/warrior_hockey_goalie_pad_sizing.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/gdgjgfW/kaplan_mcat_practice_test_book.pdfIn PDF document text
    • https://febewizonobuwom.weebly.com/uploads/1/3/4/3/134311996/7185156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_604d21f4c2c50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402944/normal_5febdc6775be3.pdfIn PDF document text
    • http://falujojul.22web.org/how_to_answer_ethics_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_602cf3fda62e7.pdfIn PDF document text
    • http://judijemavup.22web.org/annual_report_indofood_sukses_makmur_2017.pdfIn PDF document text
    • https://fiketizi.weebly.com/uploads/1/3/5/3/135387405/vewufifapire.pdfIn PDF document text
    • https://vabomunebalobi.weebly.com/uploads/1/3/1/8/131856010/fc5bff52bfbcf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/pathfinder_cleric_spell_list_guide.pdfIn PDF document text
    • http://sonasekofuxix.rf.gd/pdf_to_word_online_converter_arabic.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/fopubosixegeb.pdfIn PDF document text
    • http://tabavujafus.epizy.com/procedimiento_de_aspiracion_de_secreciones_tecnica_abierta_y_cerrada.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/fepire.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/vijiwigiwosufajoziniposa.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/inline_internal_and_external_css_style_sheets.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 5152 bytes
SHA-256: a936d263dd54ce0b71413df005f5b5e197d912b3e90e19d2e264c3989f5c19f3
font_01_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 10700 bytes
SHA-256: 783f207c79ae9bd19a5eda3a235f688c425d2a6b9bb3a9229fb51b527d398db9