Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d178ad6f8d957f…

MALICIOUS

PDF

73.1 KB Created: 2021-09-21 06:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dabdc328efbc0559eeeb2231da932db9 SHA-1: 210b2db32020d5926e1c21bf0f3fa1ce6d049245 SHA-256: 39d178ad6f8d957f458aaf05121386b8773d2db5aa181f6852fda992a4918298
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to obscure the true destination, a common tactic in phishing campaigns. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sesc-am.com.br/Selecao/ckfinder/files/veronu.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///zafar.pdfIn PDF document text
    • https://zzwgjx.com/d/files/50213365353.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/56520379059.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/51922013410.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/mipuwepezajotirilomanok.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/tuzomedanurog.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/91551689729.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e288a9cf32---kogejesesuke.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/gifuzujaw.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/dugalilugukekovaz.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/dexafewobekutokuraxun.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/lobadamaxob.pdfIn PDF document text
    • https://vpmemorial.net/images/file/90396967960.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/zexirafazoposeramuzeleg.pdfIn PDF document text
    • http://tortugafilms.ca/adminfiles/file/dafawifexaz.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/rotupejalenisegisoxabaxed.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/fifisujuxogokajuzepug.pdfIn PDF document text
    • http://vit-physio.de/file/11214013901.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/11583052331.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/72314343340.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/60490674625.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/mefedozedinuniwole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bnha+s5+ep+1PDF 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_off0000ba09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA09 10132 bytes
SHA-256: 41cb3667428a46d868f6ae9ffede59fab2229e64e1fc742605bd2487fd514d58
font_01_sfnt_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 17664 bytes
SHA-256: 257f914d9ad0d0197365d21dcd1b208c564d2fdb42fb86ab0d98265b7b58a188
font_02_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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