Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e064d3346d7819e…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 13:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8e4591e5402c76729ddab0e569822a86 SHA-1: b5a6ce7f38f56198b0960839727bf599abbd7c12 SHA-256: 4e064d3346d7819e3b9681865cb87161bbee82dc42b33051e1a87de2217304f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=monster+capture+games+for+android PDF link annotation
    • http://akbarestate.com/survey/userfiles/files/76728265495.pdfIn PDF document text
    • http://szjg.hu/images/file/wegugoxokofinigajobi.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/49875977509.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/85799212164.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/56289780727.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/bidamivoded.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/zapulafogiwibunofejeroret.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/14927136018.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/072348589518.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/62084207756.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/kowuzoxezedosom.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/17314477445.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/53869149420.pdfIn PDF document text
    • https://mashura.co/userfiles/files/fujuralodesenofolimizete.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/malotuz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ajpto12enn4l2aklpc49f35p8e/zokudur.pdfIn PDF document text
    • http://uco-kampen.com/media/files/66838496730.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/rirotikurotub.pdfIn PDF document text
    • https://hot-pol.com/images/file/6390667151.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/76946183957.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/sizagotuzulipimememug.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210918/16319458102893.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_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 18280 bytes
SHA-256: 9f2570565979e9ede3dd855eb518040de7e6a9841e2032a320ca0c55ae39911d
font_02_sfnt_off00013b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3A 11012 bytes
SHA-256: 77ba4798ccedc0d07919753c5fad668b59b6c45dcab61fd3f8676d036b1d81de

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