Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84b6b70f5f21d88…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 06:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d928553105572f4cc866063cf20f0933 SHA-1: c484661b16590ce4a16a3a35ef5f99dad4b5b126 SHA-256: e84b6b70f5f21d88e740e9a1d2e59da5f9c4e7a8615321763360e5dd1f9973d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a potential phishing or malware download page. The PDF structure and embedded links suggest it is used as a lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://cructi.ru/uplcv?utm_term=jurassic+park+1+stream PDF link annotation
    • http://ceramicaartisticamarsalese.it/userfiles/files/fesowarotolejosizozujazu.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/75727456011.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/63158565860.pdfIn PDF document text
    • http://home-plast.ru/foto/files/tovopirukomilibe.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/wegububosibagolomori.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/tejefoxitawevurifibukezub.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/87074891295.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/webodozeromipiv.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/bivimeredomowovibisome.pdfIn PDF document text
    • http://grupophi.es/uploads/files/vabazatomot.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/42542792128.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/83823002966.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/juwijumufolep.pdfIn PDF document text
    • https://sergiomauri.com/images/file/90394061281.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/basulir.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/kazixeloropunerobitumulo.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163072064649149731293.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/43315402280.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/mewofajukurubafer.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/bafifagolikawodenerenine.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/4812308737.pdfIn PDF document text
    • https://asiapharma.la/files/files/57092698326.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613a60d17a692---14722667034.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/62349558642.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/popumojakoxifolus.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/zikonotazitilexagujufiwo.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/masesinis.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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 17960 bytes
SHA-256: 7358fe117d2c91e411e5262d278a1a8cea7cb0c3c41dca6be8f477439a60c1fa
font_01_sfnt_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12393 10500 bytes
SHA-256: c299e1cdd81cabb944eb112b8ec51e22dfe05afc89c1ff589a71e1dacb7e60bd