Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b290f4ec023f37…

MALICIOUS

PDF

67.7 KB Created: 2021-09-30 15:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 258ab23957d68fd1d0c7c3f73ca5453c SHA-1: 314d1b7febef5d2daf70cf7104b0a0a23ed9e429 SHA-256: e1b290f4ec023f3780eb904f2faee99244f753b441be33fa4592113a970e8050
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that lead to link farms, a common tactic for phishing and malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document's intent is to trick users into downloading an encrypted archive, likely containing a malicious payload. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crysiq.ru/uplcv?utm_term=management+accounting+formulas+pdf PDF link annotation
    • http://canavesiobruno-architetti.it/userfiles/files/3647327625.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/79054652473.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/xilovuzubikagovuzawavanip.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/97780104632.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/bomisulafigogarerel.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/64861561003.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/65538359012.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/danitesesanixotokiwuxuko.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/48226471652.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/74158577159.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/64100459521.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/91396653247.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210928235317.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/87368318945.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161558f1b53a48---20075760360.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/60709092140.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/mavowewujakajomuneni.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/tisulilazenepova.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/xabedemonimunoxinuloro.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/zigedo.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_off0000ab36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC348 14696 bytes
SHA-256: 50e4c4ed6c1b3caaa6568f380af7b90f8cbe5bb30f2588dae4ff3e25de57637c
font_02_sfnt_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 11056 bytes
SHA-256: 7ee141d3618480b397c9be5e7a8607cb863f407bb0ea4d401807877ec589528b

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