Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2337877f192847b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-22 17:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4cfd684e838518d3fbab9cd6ec7b7cc6 SHA-1: a412975b3342b503d8b8f91942339d87c05ebf44 SHA-256: a2337877f192847bc9c4332cb7e40c0388f09c78c2800bc8f3097cbc9cdc90a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://manhalhealing.com/userfiles/file/govokepimagogix.pdf In PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/84099620689.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/lazeveduvubuja.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/sirekuxudurisatadisipi.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/zefisimuret.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/27780266355.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/43747663110.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/3920890362.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/kisegadozeruboxagobuzabi.pdfIn PDF document text
    • http://xn--c1adbeke4asdefy.xn--p1ai/ckfinder/userfiles/files/39954679277.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477b4d3fdad---maxaxadaboronak.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/58302327092.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/zowadi.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/muwalelugaxumapivelafufap.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/48157779062.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/woxufinorukivo.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/vapudesevuguli.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/15161525709.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0f8640407---xijesixagakematokulore.pdfIn PDF document text
    • http://aquatherm-graz.at/files/fozasabepobegu.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/tekexilanavajukejujonozi.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/40383867115.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/gorulibezox.pdfIn PDF document text
    • http://sdes.in/uploads/82368555422.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/7701463156.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/besumolegagunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lucy+full+movie+english+hdPDF 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_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 18980 bytes
SHA-256: bc3f5e62e9fbc61499a59b8a34d262d9c0d1a4d9e727183b0e2aea5862ad5dce
font_01_sfnt_off000112fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B14 10800 bytes
SHA-256: 2aeabf59d7fdd5f4d45682ead68ad2be2087af4b3755ad176311a40c67caceac