Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98ddc874bc058f5…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 05:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee834d78194dd2169f40033d5b343607 SHA-1: 02513444841423ff4995a565657fe9b90b28dd1b SHA-256: a98ddc874bc058f572b7f51533f2a2d4079438ced77f9f6274b3120671152c9b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=wallpaper+sky+moon PDF link annotation
    • http://insuralead.com/userfiles/file/medavedonupasuxesawuguz.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/lixikaferedikinowona.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134299336b5a---zakerulijug.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/tineve.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/gimak.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/13235195921.pdfIn PDF document text
    • https://cncunse.com/d/files/kopavisuvatufa.pdfIn PDF document text
    • http://santehnika34.ru/images/file/lakide.pdfIn PDF document text
    • http://telecycling.org/files/file/33765663367.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/73446373112.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/zuriterurelerofitemax.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/45376761246.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/bizerofexaxaj.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/pigomajanuwezitubebij.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/jagewomutif.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/gagizusodamukevuverogate.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/67306964712.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/18047044082.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/15785148507.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/lofitabunonijubu.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/fokaxapuzutafixul.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/lujowuwaxuwu.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_off0000b88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A0 16708 bytes
SHA-256: ab96b0bd7afaa81b48561d7912c0d38a6e18322e0e65de7e0a853cdde127a3d7
font_02_sfnt_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 10424 bytes
SHA-256: d2d3ef2663e65a18b888233e19f65e828d098837347c7a4440d45fb18dde3def

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