Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b737f569587908…

MALICIOUS

PDF

68.3 KB Created: 2021-09-19 05:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9d7b569e177f099546189d7cbd70336 SHA-1: fea4c1603376f7799bdb4f3cd2de4cde97203eb6 SHA-256: 88b737f5695879080624a122be73cdcc057e04682b4182f52c3fd1de20ebf018
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates that the sample is designed to create a link farm on disposable hosting, likely to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://bagiez.de/userfiles/file/rexap.pdf In PDF document text
    • https://showdetango.com/bafa/userfiles/file/53880667300.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/jadevonobepadojajikegefo.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/ridotidodupaxakotazutapar.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/kowunaseduveguveronunufen.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/83834408096.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/ziwedadebi.pdfIn PDF document text
    • http://skncn.com/u/files/60915443714.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/20575875792.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/razazag.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/gakemewusu.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/xojuwuraveg.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/tasinefasezifo.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/48366676454.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/42964790511.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/70691391305.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/xubutilisibamawuvomul.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/43445063343.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/wesovepoxoneba.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/75563616921.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/gavajetosalopikabovovin.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/vevezemupabesesifupexuxes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=any+video+live+wallpaper+apkPDF 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_off0000adfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFC 10460 bytes
SHA-256: f0dc1d8e338fa299a26336a17d5f169e64737015db17ba46e1899071f7979c00
font_01_sfnt_off0000c5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 14876 bytes
SHA-256: 6383920f2a9114982842381e2383399e3752795d5184e567a47e9145784e0f68

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