Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a1a19a6f76c64d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 07:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43712af3366f87913c15ab84c346e14c SHA-1: d16bbfc268290d129278235b073e81a88e09177a SHA-256: 88a1a19a6f76c64d509a1f1c101124660098598284d680b74c3ed6ee5df5c57f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://floresdeserrezuela.com/aym_image/files/56632530547.pdf In PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/65809339034.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/gazajadeb.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/70411402115.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/30392178073.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/69121168640.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/24708844780.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/sozowawabinipiz.pdfIn PDF document text
    • http://cssh.es/img/file/57976515213.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/duweselujos.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/31156352667.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/1239070850.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/mobemutoko.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/55759032558.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/876394694.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/zodosov.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/bebojawunoremub.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/46347925245.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/zevexoforet.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/52444947856.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/wonawosulavozeb.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/69492654924.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/28512065291.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/mowadegujinosotemimetot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=localizar+mi+android+perdidoPDF link annotation
    • 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_off0000d255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD255 10424 bytes
SHA-256: e48c172a3b9204c69127487d48ea69201cf788767194ed38b575d7c51f7b5f1c
font_01_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 18036 bytes
SHA-256: 8faea0bdd62196971764d00d6a8258c3d2057e329d41dd56f5e111e18a01a30d
font_02_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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