Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fd432d8423c275…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 22:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 245cf05acd17d445e28ec77fd552e6b4 SHA-1: 9df55a486e71c98d0c6c03168571eabd77558706 SHA-256: e1fd432d8423c275cce71e9bdacb09e051d0cef43353bfd936dc7b4f75bd2385
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, likely for distributing further malicious content or phishing. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for execution, hence T1059.007 is included.

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://ecohort.com/userfiles/files/94819534376.pdf In PDF document text
    • http://alphanaturehk.com/userfiles/file/16089662799.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/wurolabamixowogozirifod.pdfIn PDF document text
    • https://tch.lu/files/files/gadixewanuvudomar.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/zedudis.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/xuxuvokunupufuga.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/91455811459.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/9597988866.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/vikunugagujibepazufeza.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/mezawamer.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6aaccf81---vegufofupasu.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/8602682488.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/81178159479.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/32201900427.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2bfd9bebe42a520201224865c8f2b93d/44797217617.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/momojibi.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/20393986171.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/19737405418.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/61525527134.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/45776326329.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/57796690605.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/76274309744.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/26474546839.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/wizepupibetituta.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/wirepulafoler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=io+games+online+listPDF 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_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 18120 bytes
SHA-256: 3b32af5b23e279a20b78232b430d6c6c0bb110f9ef0fbb6a4d80e8fb40b43c3e
font_01_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B8 10300 bytes
SHA-256: 6a33e589d2261a2b4167700d807d7080941cd9645c0dfdd68d60411f7e039fc3