Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecebcecc0c592cb…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 09:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55ed0a634fd0e3cfb54a108140b7a3eb SHA-1: fbb2671b014448de80895f5e240797ec4a948ede SHA-256: 0ecebcecc0c592cb582704ef8176b8544774e84b7ed3db3153e22a2dc3733bab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest maliciousness, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=design+home+mod+apk+2021 PDF link annotation
    • http://ryukatsu.com/userData/board/file/72943185132.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/xejexilodurafejiwadukojab.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/kefitibexuf.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/tibapuralituvigavinuzu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d271f33ed0---9494446932.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/vupoval.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/3402947025.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/44397806925.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/19447028948.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/vasapuvukajitesunen.pdfIn PDF document text
    • http://mrybalko.ru/files/57275169728.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/15766825030.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/37614982628.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/fuluse.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/13882386575.pdfIn PDF document text
    • http://hidropro.hu/upload/vadenurejulu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0tca0pfdqrn5bgp0317777sko1/51089392827.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://archinfo.ru/uploads/file/96024171835.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/watabuwemegewizozasofi.pdfIn PDF document text
    • http://haki.vn/uploads/files/losajudogafow.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/53483358187.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/65895365312.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_off0000bf6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6A 16960 bytes
SHA-256: 0a53ac3236efd84f5780019f9c451c381c798d8f57da42e681c65e1dc8c23bed
font_01_sfnt_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 10984 bytes
SHA-256: 1c8e782a273a2c241cec905e30ea178f69818691e681214325f3f29eb8a6ae5f
font_02_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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