Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bef6231a6f3c55…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 21:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3159d85adfa71b3367553cab6781c027 SHA-1: 25d21a26ba643f62ec11b69966abcc92ee8a8c5d SHA-256: c5bef6231a6f3c5589d0430538791d733fffc6a8a3d617ffb71285c4df7c13bf
146 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including a screenshot-based image and numerous embedded links to external sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://martas.vodrsport.cz/uploads/files/xidefabara.pdf In PDF document text
    • http://samnakthodrahassob.com/userfiles/file/75484989719.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/69726873065.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/numedosufufunelazukovi.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/23641847757.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/nelebitaxitorireguxa.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/nimizuzi.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/4692744406.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/85243277139.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lewofitunudiz.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/dojazifuvot.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7cddb8779---70120367202.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/gunilozodegidu.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/89358694480.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/dirozipigumilipetag.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/fisolagupagidojet.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/57872090837.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/bolelekakomakig.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/69595818856.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0f41643180b6c27df015aa02bf2b81d2/nuxibu.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/84960303824.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/62977441402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hashiriya+drifter+free+downloadPDF 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_off0000b078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB078 10640 bytes
SHA-256: 81e0a1fc8bbb0514d3148a2e3a3960cc342a4f0bf162677fbb30f13ea5ded428
font_01_sfnt_off0000c8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C4 14080 bytes
SHA-256: 0448c165d1ecf338ae76cd439eae3cd0a9da9b70d3afe8a49651dad62ff19a1a
font_02_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1