Malicious PDF — malware analysis report

Static analysis result for SHA-256 af281e9ad6f6f1ed…

MALICIOUS

PDF

91.4 KB Created: 2021-09-17 13:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbfa9318170f320151b096c77e7beb8e SHA-1: 97bcf72e38ada06e5a94c71eab479967c0c90ca0 SHA-256: af281e9ad6f6f1ed6a932ea5773296c0e39fae5973cc53c1ba91e910212530ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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://archism.ru/uplcv?utm_term=curriculum+based+assessment+definition PDF link annotation
    • http://historia-bfured.hu/userfiles/file/52652032218.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t09sf3sqg4a8juvfktpiv3rs0a/vakuvadokaxu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/29682327683.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/pivonetirufu.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/42456448205.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/fixesawirisebax.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1c439de48b772d86032c69e9686376ab/bibizuxizamadaxu.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/43130494711.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/satoduvofovatem.pdfIn PDF document text
    • https://aayams.com/userfiles/file/feparexurolezog.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd178dec3---43515386433.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/86744828676.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/babeg.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/bifonoxafurer.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/bukibakugokajajisugajim.pdfIn PDF document text
    • http://willbramephotography.com/55299398763.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/89400568516.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/57433941034.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/7898898406.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/bafiza.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/nivevalejusodin.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/fetilosoferapilo.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/36651085905.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 10908 bytes
SHA-256: 0b437aa3df5a473c3b412df292426213aee5f5d522c534b3758683d5b84e728d
font_01_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 17060 bytes
SHA-256: d2ead66d06deb52f1e817859f8959a77c00982f9db2ef60155854ac3374e83e8
font_02_sfnt_off000147dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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