Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f19de898f98af8b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 20:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae00ad7076e80f8e5e5783081923e5ee SHA-1: ffcaa55ba8713ec07bbc9a0825fe0424cede61b2 SHA-256: 6f19de898f98af8b2e7b49ac81492719cdb2ad8b08a07957fc76e4786c48b446
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. It contains numerous embedded URLs, many pointing to suspicious domains, and is structured as a link farm, indicating an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed for initial access via phishing, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mbzgogo.xyz/web/img/podborky/files/65929059932.pdf In PDF document text
    • http://chinajnbt.com/images/upload/File/xojazutopamozamepotumuja.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/guvubidikevevoserusubeton.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/46138641316.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03c06a670---jixosififurixoxutusanuzow.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/mupejiviro.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/45105380817.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9b50be6c52533a8bcc238545736fb662/vagusemijajuz.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/gigovatanonukasezadawuf.pdfIn PDF document text
    • https://spyboarcams.com/files/supogedofajuwasokubuxeru.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/maporog.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/nokesirotoxelojuzebotafef.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/dovuvaximigaviv.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/24600114891.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/1502062643.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/55982580375.pdfIn PDF document text
    • http://livestocktool.com/d/files/59867255592.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/39294388102.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/mefonu.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/7634585942.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/mezeza.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/34652987004.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/69852745064.pdfIn PDF document text
    • https://nomortiga.com/contents/files/navalalapimilepaxijegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=como+usar+mi+android+en+mi+pcPDF 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_off0000b131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB131 16796 bytes
SHA-256: 94cfb30c5cc4757ac3de8292e33a2ad6a7de529de79d4101136ec812cf9957cc
font_01_sfnt_off0000dbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 10660 bytes
SHA-256: 96d6f1247e278d388dfc8e75a58682d9aee46ef148830398f9be3e5249b9a37c