Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb9c9bcc0032e74…

MALICIOUS

PDF

83.6 KB Created: 2021-09-14 04:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a0ca3ac8f7ab7b92764b460f9aa697d7 SHA-1: cf730c30db0803a7c82e50585fff8f5bd5a224df SHA-256: ddb9c9bcc0032e74b27a83d13f2fd329e8af35d200f8c95f92f8c4afeecc1b05
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least one pointing to a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=top+war+battle+game+mod PDF link annotation
    • https://dmshospital.com/mm_engg/files/vixekuvifop.pdfIn PDF document text
    • https://novitas.ro/files/31583827199.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/refavizonolu.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/58773511698.pdfIn PDF document text
    • http://e-district.org/userfiles/file/kevevosowimozaga.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/36881817474.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/gapetepawalisutem.pdfIn PDF document text
    • http://shahgrp.com/uploads/jedolelupowa.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/zusedasimozipodedut.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/28286984420.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/18782643448.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210904070525.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/tujanenazufezajowixunawu.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/88434626576.pdfIn PDF document text
    • https://rinducm1.com/contents/files/bedajegidalune.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/goderuroli.pdfIn PDF document text
    • http://word.mn/uploads/assets/3687233782.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a1fc8e25873ed931a67c9ae73dfd3940/zukim.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/juzenonokumiw.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/nuwofoxogukepuf.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bojasetosuzu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376561ae336---luwumenug.pdfIn PDF document text
    • 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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 10560 bytes
SHA-256: 3d25ca6f6e455bbefc206e8000b1d7dece028dbb267148c317936ffc9aaffdeb
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 18520 bytes
SHA-256: 8a11cd90c622af584f3b17208e158a3bd84dc3698f1ae90a594fba0b46f2cf84

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