Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b95d0a0a992de6a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 06:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 15e2fcc1c72f38d2a305af24b90d9c23 SHA-1: 3ac9e1a32654c573816e0a3ca328bf112d0e24be SHA-256: 1b95d0a0a992de6a4791cbcbfe1067eb5240e0d13ccd002daa9f0bdebfad5a2c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=job+bible+study+pdf PDF link annotation
    • http://mariopresto.pl/userfiles/file/64565554678.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/21019842944.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/46359729341.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/41580027797.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/82726694432.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/35421008734.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/30308952986.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/filal.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/23601183702.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/88023197537.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/zibopusajodukufofifog.pdfIn PDF document text
    • http://zzquansu.cn/d/files/fenawafifos.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/misumojox.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210901234954.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/12190253921.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/19155585858.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/wojavazesuzevukujofazaxum.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/soletazove.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/22371616243.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5dde7899---88095785779.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/93051802369.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/kopalivelobesadenos.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/11443961999.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/34427916810.pdfIn PDF document text
    • http://dasbluemchen.com/88466640368.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_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 10468 bytes
SHA-256: b6a39574ae349f4cfe9dcfddcefb9294bce979ce53d316fae9373cf50689abf6
font_01_sfnt_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 17832 bytes
SHA-256: e78f851f9e7b39684aa0dd99ca8b89aa17703379ed9a074bc204a1246483d68a
font_02_sfnt_off00012a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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