Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd801c3e910ecdef…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 21:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3791d114d53794016f37e1052c54a0a6 SHA-1: 1d53046aebcce607de2c75fee951e6efb4a3e64b SHA-256: dd801c3e910ecdef820c82bdf8407af98b0146543f5288553464c4b1c13f3082
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=put+my+phone+on+ringtone PDF link annotation
    • http://banghetretunhien.com/media/ftp/file/3058949240.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/xopuba.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/10124329215.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/ruzejolem.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/wifokok.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/55089506978.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161424bcadc0f2---86267869854.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/58030166736.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb8bc5d16---1504700315.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/67687002937.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/winamogavamoxodep.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/28049126989.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/56248433418.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/kevemofusezumunomize.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/lewipuguroze.pdfIn PDF document text
    • https://network-italia.it/file/25529142214.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210923_BEFE4EB9359A47BE.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/moduzewozut.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/bezemidagapigi.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/89287524181.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/gapujakidarufomot.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/xudujewojipika.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/22306578388.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_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 16712 bytes
SHA-256: 66078c5926bfa5b1c1cf471f8197538490196a27afa2c472397570eb1a7a7538
font_01_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 10536 bytes
SHA-256: 4e5fcaa7307328f528c02ea614ea535890ef70bb504cd09a16bd797c2fee1532

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