Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3429918894b7c0…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 12:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09be04877c196ba233ce59f894d78094 SHA-1: 121105ccdc02029ee78c1ac988babc06d69cfdc5 SHA-256: bd3429918894b7c055e4e36b0dd4eb0136288a34e59627dd42929f86a12894b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The high number of external URIs, many on disposable hosting, suggests a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://reguitti-engineering.it/userfiles/files/75795092846.pdf In PDF document text
    • https://lazdynumokykla.lt/userfiles/file/budodowudugawadopug.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/40688877776.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/72420275391.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109070037183690.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/79805675260.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613beeffa9799---55932322373.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/bololejezeruvono.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/25009634231.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/detezixal.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/vubemipexuvajalotaza.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/losarexofalowotonovipafi.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/pebunito.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/10896418634.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/tojefom.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/85363362639.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/19188427620.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/71504357279.pdfIn PDF document text
    • https://biomisszio.hu/tmp/vogatov.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16142a3097c92b---nolidikiramowiwotexetatof.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/gizejusobukugiwiloriviles.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/38f2cd7fc78d8523a00ec6df1f0aa40f/88763553538.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/milovamoliwidala.pdfIn PDF document text
    • http://rjt1.org/upload/files/93661951559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pako+apk+modPDF 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_off0000b5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A6 16168 bytes
SHA-256: 03ed8832dd4af5923b5ff1de3fb41be554d6bb1508c872bb9dac80e1e0f61a8f
font_01_sfnt_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 9904 bytes
SHA-256: 00a91d0966415dc5fde8477fdbee7566ee38a21ba84a9026613011954c506976
font_02_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1