Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceca652ae5bd8616…

MALICIOUS

PDF

88.3 KB Created: 2021-10-05 17:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1c60e149f303e3f2e2f88604e909ae08 SHA-1: abdb36f240553c96a61aa676013d0042bf819f40 SHA-256: ceca652ae5bd8616103aaf8c4b0ad5a180ac64cc3792c402722a245274eab876
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains a link to a suspicious URL, likely intended to trick the user into downloading a malicious payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document is designed to prompt the user for a password, a common tactic to bypass gateway security for encrypted archives. No scripts were extracted, but the presence of external links and the overall detection suggest a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=how+to+unlock+my+phone+if+i+forgot+my+pattern PDF link annotation
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/kawaxemujukafitipap.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210921_2E887DD0D475F7DB.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/rozogexedazobepuv.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/30717099619.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/lisujar.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/17143475709.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/55600977886.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/49393952108.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/zexejin.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/99316983558.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/16668461008.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/fobuguvololizoxaruzupoz.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/mosisatusevezimiw.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137a468c3089---xalamonofimatogadubudi.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/ladateb.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/kegifevametogasa.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20211003065839628.pdfIn PDF document text
    • http://classtool.info/upload/files/14563961452.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/57900537382.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/gajuwimewewapaxe.pdfIn PDF document text
    • http://holzweiss.at/xajog.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/76999875322.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_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 11140 bytes
SHA-256: c6f31429902cf1524b60b9208d09ae2b581e876594bc83a65e880c8b088251fb
font_02_sfnt_off00011c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 21008 bytes
SHA-256: 4fb768f1c5149e6696f6a32fc3bf8687a246e30de7276d42a9fad0059367cbd4

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