Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfdab7e6a411b4a…

MALICIOUS

PDF

74.1 KB Created: 2021-09-09 19:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fd71afd38e70867e59273fa41b89131 SHA-1: 43ce2426e7ca7eadb8ccd600a9efef04b8efd65d SHA-256: 5cfdab7e6a411b4ad4520babf20d81d8797e6dad5f86bcb02b2a21a490d40757
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a strong intent to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a malicious redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=balancing+chemical+equations+quiz+answers PDF link annotation
    • http://lab4050.com/upload/editor/file/newuwepadebipidaj.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/faxepikedatinasobewa.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/bogosebovafonavawifup.pdfIn PDF document text
    • http://standdominica.org/files/files/26807539880.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/80227104042.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/35066462972.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613352d285310---31567741709.pdfIn PDF document text
    • http://teifsepahan.com/files/file/gemaximumazuwagu.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/44968294952.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/wobumero.pdfIn PDF document text
    • https://shunnasato.com/34232345562.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/kimewolifarudomamuwat.pdfIn PDF document text
    • http://zaiger.ru/img/file/xalilojatipimirav.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/47634124914.pdfIn PDF document text
    • http://grupophi.es/uploads/files/89937713994.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/mepelobofuwanawijenu.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/43302646420.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/29133272580.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rikuwiravodalofisadowawa.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/75443275049.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/96788378547.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/medefowubekema.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_off0000bde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE1 16800 bytes
SHA-256: 8ae857267c8c6de58905a0ee63b223d0db9bdafb55c179173d68a9a603f83302
font_01_sfnt_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 11124 bytes
SHA-256: 8b8ad0802e50a1af1b7220ab9bc4b02e42df47d595d46fae59f79cd08a272326
font_02_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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