Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16bb976471f03c4…

MALICIOUS

PDF

75.5 KB Created: 2021-09-20 20:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ecafe662171005eca1630e1327c73f86 SHA-1: 516905bc25ff5cddb959f087557d347671e9cedf SHA-256: d16bb976471f03c4820c0eb89d06154107b4035956e8cd282519f8c90a7d4889
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious content or phishing sites, indicating an attempt to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a network of links designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c30fa445d02f5ad3b5293ef87248e394/zorofifamisezifikakimi.pdf In PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/77053659244.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/55718722005.pdfIn PDF document text
    • http://hnhappiness.com/d/files/wanofoxawixediberavepifu.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/tebamar.pdfIn PDF document text
    • http://checopharma.com/upload/files/lidoridunolebelebof.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/43938226116.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/58077081021.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/67806191809.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/15385883723.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/21977649639.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/70522489878.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/30317031026.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/4538045498.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/gejafufuxitelir.pdfIn PDF document text
    • http://teifsepahan.com/files/file/95061746523.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78543599334.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/83129760596.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/mutusa.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/31179118061.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/12567113192.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/71510558863.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/meboxozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=truecaller+download+apk+for+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 19264 bytes
SHA-256: 2259c552dce527188ba0cfdb89710bb6b9354d683e6b26f632b5f3be949459f0
font_02_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 10588 bytes
SHA-256: 21486f7daa1e266f2a9d10422b6cb87732ab7b38a384606aa20adeeeb5b0cb24

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