Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45f151827522ccc…

MALICIOUS

PDF

76.2 KB Created: 2021-09-28 01:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 968ec9630a522ee18b860ecf1d3d1a7a SHA-1: 2248bbfd718a6ce0ea4210ebfe7a0fb845c97677 SHA-256: a45f151827522ccc8f6af8e5d7c53d1f8487f7f45f74ffa777076fcd0f852608
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely involving the redirection of users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://sanmuabancongty.vn/images/content/files/sixepe.pdf In PDF document text
    • http://www.firengo.com/userfiles/files/doriwogowopuno.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/wavuto.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/janunisaw.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/wigesokemegoj.pdfIn PDF document text
    • https://kawanmto.net/contents/files/jupaga.pdfIn PDF document text
    • http://adveotec.com/img/file/53627783814.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/30555693252.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/62217155038.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/firubipabadiviwuxafebidu.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/juwonixomovulomuwirapero.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/o3tk04pjjeuhbo5pqe6vkmhrci/4733672139.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fef977f283---gurolezupivelisidegeru.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/wogorafetizonoraj.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/kemowumikidozofaliwe.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/bizumugomogelid.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/30798551994.pdfIn PDF document text
    • http://wawa757.com/uploads/files/84129115599.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/71876912851.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/bunalafefutapid.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/51140881336.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/fiwotiselexekanugolimefej.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/11196096012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+book+cataloging+app+androidPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB0 15188 bytes
SHA-256: fd0a36b25e49df783e80a120259748276911d01c72eb5af9d165682c0d8314f5
font_01_sfnt_off0000d478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 18612 bytes
SHA-256: 12485bf74e2d814a2017f052683ea468a4d58e2133af59c9b3679047cf6915c4
font_02_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 10976 bytes
SHA-256: c5d185681da37d5362ba12e3e0f095579eb06d769d57e7cdd445f2672db8f551