Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2dd98b2e227ebbc…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 07:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 48c655b94567a9e51a7d0b904d27c65f SHA-1: cbace9665a5cf727825d6e81a6678905cdbd430d SHA-256: e2dd98b2e227ebbc9508e2c5e6e35b453da4487f8d4465f112a74097312ce05e
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/uplcv?utm_term=weird+words+that+start+with+m PDF link annotation
    • http://ingore.cn/upload/files/vufefigurowa.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/20521954777.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/dujexadakaxumoxavokaz.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/23193846279.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/nabikesobebezer.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/70cfc722cbc6226423527c4a90c96bb8/jeravinewatefozo.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/vodewarotaximefaji.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///judipuxuv.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/tamulujafegixatizi.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/29455357687.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/47088177246.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/63297883834.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/flag4jk42iuvb4glpumkc8ecrn/tuwasaminemedifupojomi.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/wogurem.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/vixejisajotex.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/36477628028.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210912161343.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/99108923824.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/repudofitosidefixogomive.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16311877513476.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_off0000ab39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC350 10444 bytes
SHA-256: 07b0624d0b52367f96767281c69d76636da4c30b93e35603e4e47614876c6e49
font_02_sfnt_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 15556 bytes
SHA-256: a13d801e9522d2f6ef076f793ba35f4a02447a5a9f0d6d7148e4ceaca5637f2d

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