Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3409fe771ec6aa…

MALICIOUS

PDF

68.7 KB Created: 2021-09-23 19:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70bc91bd7d1cfbb824cc06aaf5caf4bf SHA-1: ce67d5266f1fad78a7275feb29eae2a5e359f4fd SHA-256: dc3409fe771ec6aa88df1cc07f870794388c67a63aaec37a45027a51bbbbc645
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous URLs, including one that appears to be a lure for downloading a 'game of thrones book pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=game+of+thrones+book+pdf+download PDF link annotation
    • http://cartonwrappingmachine.com/userfiles/file/wovibapatewaguwetute.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/96430745635.pdfIn PDF document text
    • https://newoptic.sas-global.mn/uploads/files/42051862268.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/19612079984.pdfIn PDF document text
    • http://noithatvietsky.net/media/ftp/file/birawovak.pdfIn PDF document text
    • https://agrando.cz/files/file/nozopepevovoxuzok.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/wotixuworejijozaxumi.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/2597211886.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/fufujaresaporikamexaxid.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/lagev.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/97090940066.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/68866855003.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/daduzopa.pdfIn PDF document text
    • http://flexa.cz/docs/file/51412077370.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b3c56379c---70788968421.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/82595283760.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/60101544548.pdfIn PDF document text
    • https://penzion-palice.cz/content/relokelevapulevemelemasi.pdfIn PDF document text
    • http://mebco.ru/images/file/954870313.pdfIn PDF document text
    • http://vbond.hk/editor_upload/file/24330239215.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/27498661051.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/55719359280.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/4gqoacdci7fho1l1j48eh82rv1/rasepiverewakulu.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_off0000affd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFD 14228 bytes
SHA-256: 8b6b32568cba809081dc15ace4112a81103a51fb22dd08ce635196116435049c
font_01_sfnt_off0000d37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 11028 bytes
SHA-256: 55f0440785dd27de85a5e67fb03bd0aa51f18bf1765faf88d5fb0ce577a8b930

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