Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23bc5955fcc8468…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 14:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3c35f4d5e5d06c2c09574c0ed88fc00 SHA-1: 2f31fbc7aa95725cb21234e27d8d64c2bdbcf4d5 SHA-256: d23bc5955fcc8468f81b92e6ba6ed238d5fd9573f6589e3a29effb1f7595c760
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://thekitchendesignstudio.org/uploads/files/jubibakaraxobemuzezigal.pdf In PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/bimejasepurulogazideru.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/80453937562.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/zodali.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/59428981992.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/60337375722.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/volujufilutevusorutupozek.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/lkod56q4h16m48k34jg97fuuq1/76914575874.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/sobakajujelafijiral.pdfIn PDF document text
    • http://zuche0551.com/upload/file/timibilafavixutuw.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/jubovoxiweta.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/rokabevolokuv.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/gasawakibixesaxaga.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/bamugotopogugolix.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/87760098854.pdfIn PDF document text
    • https://edex.co/userfiles/files/8834071938.pdfIn PDF document text
    • http://coumert.com/images/file/tomakapesitimiderapeko.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/wofimaregojafuruta.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/zosebarukupasojozuv.pdfIn PDF document text
    • http://bulmarconsult.com/files/fotug.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/30233263891.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dbj1sh39p9du8fnmhghq3tj663/melikajumufitovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=color+sms+premium+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_off0000bd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 10436 bytes
SHA-256: 9e161a7321dfad6cd04034cbd9e4c9fd35d14ab84ec61d45b98d77a2a242cf29
font_02_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 17968 bytes
SHA-256: 37d40cdfde28fd6a9f2559b12cc38eea8ae63947db70d822fa0c9d8199844f4e

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