Malicious PDF — malware analysis report

Static analysis result for SHA-256 6102a5f9d800c871…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 16:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5390f4ed4d35d8ebde187177f23f6ef SHA-1: 15851afb77286431cd730495cadb7d8751900d40 SHA-256: 6102a5f9d800c871dd695dc95d291c0d9b67d2d28fb3fa3f0c51cec54db02bcb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one identified as a link farm on disposable hosting, suggests the PDF is designed to redirect users to malicious sites for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL usage are consistent with common PDF-based attack vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=comedy+movies+2021+tamil PDF link annotation
    • http://abwingstop.com/uploads/files/ruvalejegujowepomajuvimen.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/23266759388.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/rezubajekew.pdfIn PDF document text
    • https://teamcode.net/upload/files/zuketunuxogijumolurinuxan.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/68511967633.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/zevomeridavuragofab.pdfIn PDF document text
    • http://ore-processing.ru/d/files/70718924034.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/80240340900.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/26511788853.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210913222416.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/33796468916.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/lapak.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/40324768439.pdfIn PDF document text
    • http://innotack.com/userfiles/file/94409736487.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/29659166792.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/4741168654.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/52272742131.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/nipapezetasozebupolimudo.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/bepukevevitid.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/rumafedijemuraxuvi.pdfIn PDF document text
    • https://isosklo.cz/uploads/fipurefilobukugisijisi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7a9b00e6---xavobutejabukosuzomawap.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/xewemozalugogudaxojegetop.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/xufij.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_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 10708 bytes
SHA-256: 965045c8030d14b4d787b655d36677ca9be5805f103e6cd6f685279d9ba5bd81
font_01_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 18428 bytes
SHA-256: 11c6a5ef8e1212286c1bfc20a9a9f2014488884a7d837e94e5018d501e10feca
font_02_sfnt_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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