Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c56f0c5af3b484e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 10:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 94b5c31a975ac625035dd6782abf938e SHA-1: 5a88c74293b371c2b64af976b32378e6ce3ff721 SHA-256: 3c56f0c5af3b484e932f494c112dd6c07b8d5770815fd78c137987589947d64b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://uts.edu.co/portal/app/ckfinder/userfiles/files/47066621621.pdf In PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/6502316369.pdfIn PDF document text
    • http://riviera.az/userfiles/file/15161824166.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/mobesigelovip.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/fudubonedolu.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/21992061658.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/lotivowavujalanabitoj.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/mepotalatubasi.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/ruzowewim.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/7142801065.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/27141201196.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ddbb355a61c533364f0dcaf16881d787/94267353857.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/75785045004.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109010716177211.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/49472234248.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/50495882704.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/vapixib.pdfIn PDF document text
    • https://biodez.lt/i/File/zogisolusafafuxikib.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/sopiruladopij.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/19818007086.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/6567304809.pdfIn PDF document text
    • http://wamer.org/userfiles/file/lebuxisugamunarofus.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/lijezanawesejogokiw.pdfIn PDF document text
    • http://artepcb.com/upload/files/vofufagotik.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/nodabekazijupaxesuxuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=base+apk+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_off0000b093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB093 16116 bytes
SHA-256: 3bbf5187694f30a416fae7dc9ef876a036c619aa9fc01fd223e0aec28a6a2223
font_01_sfnt_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 10324 bytes
SHA-256: 4d087757132a6de9a61e27f2e28ff265ea5801894579a7b3d681f659ac3ff804