Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c282bc8b1d8228…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 14:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71abeaffd1d075d0f35cbb82e8d50f73 SHA-1: 540ae4a831e7b268b4905ce7034523ea9b9ab5da SHA-256: c4c282bc8b1d82287b6deb7844bffeea030c4c5416d34dfcffc4ba6dd4264779
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a strong intent to redirect users to potentially harmful sites. The presence of external URIs and the ML classification suggest the document is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://krisoc.ru/uplcv?utm_term=jw+library+apk+windows+10 PDF link annotation
    • http://ablerexthailand.com/userfiles/files/pikizobetuwumobabev.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/63430998119.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/76505379883.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/25836602400.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kemaredopur.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/67893867138.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed6a3d5923---16042961059.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/61729318051.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/48630923523.pdfIn PDF document text
    • http://dobermanncz.eu/files/budawofavegema.pdfIn PDF document text
    • http://dd-eng.com/files/files/34283189375.pdfIn PDF document text
    • http://eternaseguros.net/files/files/20339740583.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/12429555975.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/42602407795.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210906_8B6D0B5B1B9930F5.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/kozezefovinip.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/75748635683.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/dezudubiw.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/21797277875.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/rizofezoxatutogedepomi.pdfIn PDF document text
    • http://turatabor.hu/media/84764246755.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_off0000ad21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD21 18100 bytes
SHA-256: 69d0ae96dd3005a34f2a3eedb0e8d3c6bb0079868b605966ca52fa8b067c10e1
font_01_sfnt_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 10752 bytes
SHA-256: 3e6ce341c6f6fc056d7e6932a01ecf1e46445babc0df26f13cf34b0677b58ebc
font_02_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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