Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d5d7ba1f87a93f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-14 04:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aa157821f3ef6799d65c07e62e94baa8 SHA-1: 34fb077ed4d657f3542822a4efe0718e77d42058 SHA-256: 46d5d7ba1f87a93fd1ac4b3a1d762a25d7a3456abc18c08d68ae04011002018f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's used to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddfed70112---9776246762.pdf In PDF document text
    • https://signika.pl/Upload/file/xilidap.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/89334560836.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/17372145172.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/55506429886.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/gozubufazofukamupove.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/zulazozazaba.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/wozuwod.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/31705387824.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/zuruguja.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/bafuzap.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/fixolituzuwubajoru.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/dilufevewikedivirudasina.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/faluxilusisitusimi.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/joxovibujud.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/36107783974.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/31502726826.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/23789310158.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/422597739.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/jidejotitarebef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=omnisphere+free+vstPDF 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_off0000c3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C8 18504 bytes
SHA-256: 45a15cfe5c32037f54b90a1abe5bc9db781c505daa2e51035984cb4e4931d445
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8B 10388 bytes
SHA-256: 2413abdd1f2eca3fde3383380b20652324c23f94836b1664b67b441db7af4ab5

Open this report in the interactive analyzer, or submit your own file for analysis.