Malicious PDF — malware analysis report

Static analysis result for SHA-256 374f54f35caaec63…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 19:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c383548b6daa863c21692fff6a1a3a0 SHA-1: 11300c4de5fe6f0b2a1d4b2bec0da2f0a16f1789 SHA-256: 374f54f35caaec63d9ec226efdb6c28fb5007fbf26a5b7cdf46f0ccf8b2feb45
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://hockeydh.com/files/ups/files/50667350632.pdf In PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/88606503002.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8ce77ec7a62adbc0a0193c05987dc826/burugudixogusewuvewodomi.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/tadaj.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630803515.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/pajowivejagegalagisesaxa.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/nusofijiv.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/resapejobivetekimu.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/92119719733.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/75230309285.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/40330977320.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136aab5c2c31---15852338213.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/negadikudot.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/xawas.pdfIn PDF document text
    • https://premiersuli.hu/files/files/10002845010.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/kewuxasebezu.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/zazobetawupinizegubufolaw.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/25837083888.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/72514599475.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/9839013552.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/29223687080.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/19438980051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+type+squared+on+androidPDF 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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 10776 bytes
SHA-256: 836978066ea980a0f6eaa1d6eeddc58746c2841828ff7d9e1a0413eafbb9ff20
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 22220 bytes
SHA-256: 671afdfcf737623adbab5333e53573e8c451bebd63568cefcdad1a8464a2ef54