Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b02062710bd0df…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 10:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5063b2617e59d32e4a1f195d48a907ec SHA-1: dad709eb55498a6b7528a64d8e90f21826963515 SHA-256: 35b02062710bd0df6ec1d9afd6cf2b78b99e500483800e7d309c2a87cd063094
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to suspicious domains and are part of 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 URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.scmsgroup.org/ckfinder/userfiles/files/93358659372.pdf In PDF document text
    • http://gordostcrista.ru/userfiles/file/93021027820.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/vimapuw.pdfIn PDF document text
    • http://prmakeup.com/Image/files/41073670693.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/46533360547.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/razawa.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/84503488792.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/45022912546.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/zipepepowagij.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210927_BA9D2F0ABE09E3D6.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/mobiwaf.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/lopirosuzifero.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0c7397c4---37411430713.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210913_A4F7B7C213E9735D.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8d67cc6d77578ac57c12eee1c4740d95/gofuvogovosewamidufobibe.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/70029274521.pdfIn PDF document text
    • http://terlickodds.cz/www/www/fckphotos/file/wifetazogajerumidin.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/tukepatotonugi.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/nirewegozuloranum.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/tuzolibasibog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=house+party+game+playthroughPDF 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_off0000abb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABB9 16244 bytes
SHA-256: e145342767997f89c423915bad1bdb32b7274a28eaf5e05ab2cc1f26053bbdfe
font_01_sfnt_off0000d4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BD 10708 bytes
SHA-256: 05cfae26e30137214cc2f1852f258bc10616693eb8e801ee00da89334c8959e3
font_02_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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