Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfe1d7f07aabab4…

MALICIOUS

PDF

74.9 KB Created: 2021-09-29 10:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d70de1c9a32f81f2616fd5cd50970358 SHA-1: 756beb2ef7a8cf4e57b220e2ce410af415e82f28 SHA-256: 0bfe1d7f07aabab43a99e70f95c6848d0b28a8d7d349ea1338f17d0149880cc7
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to unknown domains, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://tommytest.dish1314.com/data/html_editor/files/dakifeginatuxelexapumidi.pdf In PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/36183474373.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16152045f005b5---pojeketu.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/63585986855.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/timop.pdfIn PDF document text
    • http://zeci.nl/im/image/vurogexonojepodazapo.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/2573904380.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/divudadetofebonexosune.pdfIn PDF document text
    • http://superazs.ru/images/news/file/95306353911.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/17671052854.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/99478849167.pdfIn PDF document text
    • http://traviet36.com/upload/files/20802552213.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/sixemiwatanaduvabumagiwi.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/88201998210.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/libuw.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/kujarudizogopi.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/verisezonotejafetewe.pdfIn PDF document text
    • https://masukpt1.com/contents/files/pulafage.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/nisebapakatuseg.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/82319000758.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sewoxovajoliluji.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210902_4491A7EE21118641.pdfIn PDF document text
    • http://tfforming.ru/d/files/58551868817.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/notovavubewepapiforoxujet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=shareit+apk+for+pc+latest+versionPDF 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_off0000bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB79 19128 bytes
SHA-256: 72cfe198fae9e3c3127477d36ef365fe385be775e10b7da5722ade7febf9ac7d
font_01_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 10812 bytes
SHA-256: 48fb1859efc3f6a2697e7da737daa650c873cd0d06ce42ff686dd11d6d470494
font_02_sfnt_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1