Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fc928e4c7f0430…

MALICIOUS

PDF

63.6 KB Created: 2021-02-07 03:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6ce0d9ccc8830561de183c9ad0314885 SHA-1: 3a24930ef6882027e58d710ca4b7a91f76a67cd7 SHA-256: a4fc928e4c7f0430fd9294772d824a83b4b8e145cc51b9f51f9241fe471c2339
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a PDF link farm with numerous external URLs, such as https://jottigo.ru/wb?keyword=barron%20sat%20chemistry%20pdf and https://monowulesamewul.weebly.com/uploads/1/3/2/6/132682048/nigutajuduled.pdf, strongly suggests an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wb?keyword=barron%20sat%20chemistry%20pdf PDF link annotation
    • https://monowulesamewul.weebly.com/uploads/1/3/2/6/132682048/nigutajuduled.pdfIn PDF document text
    • http://onlajn-kassa.ru/15974832190xzxdu.pdfIn PDF document text
    • http://tohld.in/vsphere_client_5._5ka3jc.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/c23165.pdfIn PDF document text
    • http://idealslimitaly-official.site/35553870330b84gd.pdfIn PDF document text
    • http://molotkov.site/xxx_video_playertnyn5.pdfIn PDF document text
    • http://komarovskii.xyz/cerro_gordo_county_jail_reportafvnz.pdfIn PDF document text
    • https://cdn.sqhk.co/narobalof/rhcGqha/mechanics_bank_close_to_me.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/sample_letters_for_ielts_writing_task_12pciw.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/rakabexozu/canada_immigration_form_for_visitors.pdfIn PDF document text
    • http://lusuzajemofim.rf.gd/79262251707.pdfIn PDF document text
    • http://gonuwufif.epizy.com/ftp_directory_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/understanding_poetry_figurative_language_practice_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/54405622808.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/vulipiwidokizetowuratikid.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_off0000bc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8B 5516 bytes
SHA-256: 86cee2cde8697bd74466965f88cb025efd5130c46b54c350ee316d970c4a9f3a
font_01_sfnt_off0000cf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2B 10136 bytes
SHA-256: cd96b392f99363d184eb013323663a6cc157a531f95587d800d78001550b8846

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