Malicious PDF — malware analysis report

Static analysis result for SHA-256 af30e547c9fdd260…

MALICIOUS

PDF

75.4 KB Created: 2021-09-18 00:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4087fecacec244545d3bba4b1355b2f SHA-1: ab9a9fb0318d2b7cdf9e8f7ea9e01a3b945193b1 SHA-256: af30e547c9fdd260ba28793e070e6590d0a4d65b9f81ed9f0113cc94a60df7e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is structured as a link farm, suggesting it's designed to redirect users to malicious sites or download further payloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://niboparis.com/upload/fckeditor/file/1630668674_1.pdf In PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/dofixoxadogevivof.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/wafowedepibuz.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/29923913989.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/bilonumakadinir.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/33263329306.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614323f03a1dd---zefozupolosumojafoza.pdfIn PDF document text
    • http://iltorg.ru/upload/file/rokoge.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/kubutirorutukepoxo.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/24848819035.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/33655501281.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/32726461529.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/2059108628.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/zoniwezesubawub.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/3197804334.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/80698452195.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/87186019016.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/fiwepa.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/fefexuje.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138faf7a6ea5---rudosegivafudasoxazel.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/polifuzemafizupewosubati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=clash+of+clans+th+14+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D9 17540 bytes
SHA-256: 49a75f51ab4602debddaa8bf38454ccc6b2bddfdf9929797c1cdb4fee66d9a62
font_01_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 10508 bytes
SHA-256: 45014196a47babe45bfc987c44b123b91fc0a6c8f7c743260105cde524e17e77
font_02_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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