Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e830e323413132f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 01:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 920ccbd731f1467ef1e5b65c36e75f73 SHA-1: 2db2e380cb78d54dbe6af534824d7385f9e09a8d SHA-256: 6e830e323413132ff172833be30752b8ae16263e2adf551e272da354bc37d8bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383c5914b53---nuwovu.pdf In PDF document text
    • http://signauction.net/userfiles/file/lagutomokabiluvefako.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/bewali.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/novejelematiwameji.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/vegute.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/12707334123.pdfIn PDF document text
    • https://davaocarrental.com/images/file/75982587243.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/79122567482.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/12351983153.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/tutifez.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/rotejidenajixenudepew.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/pizibunakoxezototili.pdfIn PDF document text
    • http://iccarrentals.com/files/file/ligofomiteleva.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/96901999997.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/75788850867.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/nabarutotunuvizomisu.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/tinanaxejonizi.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/o1nm1svpgv6mp8e0kipn1agbkm/30304921198.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/7684347624.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/67199941352.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/58641598288.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/25029553859.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/zixuladegitovudin.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/geroximupefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=make+video+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_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 16640 bytes
SHA-256: 599438d065d3219de930abe52c8ff78fde651c9db40b993b52acfa7972ef607e
font_01_sfnt_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001198b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 10020 bytes
SHA-256: e4abc3fbe8e151891a098ec8c850bf80df419d8529baa5d449496e139995c5da

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