Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fd76dce2d8de70…

MALICIOUS

PDF

92.6 KB Created: 2021-09-20 05:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7b316e15939d5436554cd9822b5f1d2 SHA-1: 8a77c23186fd4e477cb89d34b6ad45f0b866045b SHA-256: c0fd76dce2d8de701f3c33fba3e223b187dec22ca4fa36dd10dabd3b04d7c364
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs are embedded, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alice-immo.com/userfiles/file/62448754301.pdf In PDF document text
    • https://reparation-mobile.net/userfiles/file/zuwipofabobosikotobuza.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/25284405781.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/3641980546.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/gilipawonixezik.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/46796845797.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/gepatewu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613baee857cca---dakogetiwa.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/gatojomikifuvemubu.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/mubaxopidikabakaxubidoxar.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/vupufedexinexat.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/81736072867.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/14560516341.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163071913755209409424.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/zevoxemam.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/85990882908.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/88628771427.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/652cb574f3a234d011ceef0c7d4cad78/nesodumipedud.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/sebaverinerifazatige.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/54057936915.pdfIn PDF document text
    • http://skia22.ru/pic/file/lilixo.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/31136306227.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/73824005465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=super+app+lock+fingerprintPDF 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_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 19616 bytes
SHA-256: a07281cae2db9ff09b77d31e998b93b7fbe2c0b571bb9c9b9fe3af3f6f44b05b
font_02_sfnt_off00014c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C21 10752 bytes
SHA-256: 2517c4ae82bfcd19b6665f70f26a5cd32421f94d1c5778e7b9ae6ad323a4109d

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