Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07e7bae3f3be0fc…

MALICIOUS

PDF

90.5 KB Created: 2021-03-31 12:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 09393daba86986430cc7dc18dd2c0050 SHA-1: 0a8f770bbc06c76b996f3c55b6867cd5d83cd37e SHA-256: e07e7bae3f3be0fc8a14ab34de27b0338b0dd4822dd3139421c0b10b5b449672
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are disguised as legitimate resources like 'BBC English grammar exercises PDF'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing operation. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to malicious sites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://vilenefex.ru/award?keyword=bbc+english+grammar+exercises+pdf PDF link annotation
    • https://cdn.sqhk.co/reparepoki/dMCZbyi/homemade_gingerbread_cookies_recipe.pdfIn PDF document text
    • http://virnet77.ru/dininotegokolawp93f.pdfIn PDF document text
    • https://cdn.sqhk.co/jodariwem/AQMYogi/slots_msn_free_online_games.pdfIn PDF document text
    • https://cdn.sqhk.co/xezufulozuwo/hdJhbjh/ridotis.pdfIn PDF document text
    • http://devlp.design/13133658943i6e6o.pdfIn PDF document text
    • https://cdn.sqhk.co/sisalubitot/eucijeN/president_debate_2020_who_won.pdfIn PDF document text
    • http://se-mrush.com/bissell_powerclean_rewind_pet_vacuum_instructionsjfcxq.pdfIn PDF document text
    • https://fazebepipetuko.weebly.com/uploads/1/3/1/3/131384618/nudokadexel.pdfIn PDF document text
    • http://itclick.info/dobofuzuzuksgty4.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/loreruzediw.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/96634182818.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/banking_system_project_documentation.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/rizoli/72088061149.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/sakotufus.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/14999381613.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/sky_answerphone_service.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/29583307894.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/58228160979.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/65152906917.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/sabigodalipu.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/bup_admission_test_admit_card.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/serimopumux.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 11408 bytes
SHA-256: 11f045cb252e1596ce24a90ea2ea21b587ce05d116e593240fe9ce8aab1a1bbb
font_01_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 5824 bytes
SHA-256: 58f2a2c052c2aac39740b9cc103f924819f95bd53852a4ae90d7df6a192f0411
font_02_sfnt_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 11252 bytes
SHA-256: 098c35d8416ea57025109d0b1b23c99235a035e97b74d5ceb1f9285ee63558e3

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