Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b780e0f502806e…

MALICIOUS

PDF

75.7 KB Created: 2021-10-04 06:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 925f5c2b38a894bce76d55b01f1f8018 SHA-1: 47fb0bcb2dc91ef7df927b7a5cdd3cd80d9d0238 SHA-256: 45b780e0f502806e4049e1bc43ff7d8c0155f2b690803d1fbdec6d5ec8961107
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, characteristic of a link farm used to obscure malicious destinations. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a phishing or trojan delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kammatrans.com/userfiles/files/jusexemugerasilufe.pdf In PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/wubetul.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/zatatukefutedenasuv.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20211004050853.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/51726019374.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/sawokarisoleliriwe.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/wexisopevozanibi.pdfIn PDF document text
    • http://fini.hu/userfiles/file/tigaliniwofura.pdfIn PDF document text
    • https://digireg.sk/upload/fonegunovaduromil.pdfIn PDF document text
    • http://steinemann-ag.ru/nokabudegufazexuzutuluzor.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/76396368658.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/tabupopifuwijizodudasuf.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/powatasuseni.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/birepenoji.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/xenirofe.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb346dd69---xifofisuvufib.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/66502956068.pdfIn PDF document text
    • http://abnicum.ru/files/file/xijalowajitorevumigenum.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/fejewuzevelikarogivo.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/putuwew.pdfIn PDF document text
    • http://caratow.be/userfiles/file/wapalegati.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/xigoxolijejixi.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/paxulo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614f735fb3cd9---mugeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=newton%27s+method+for+solving+equationsPDF 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_off0000bad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD4 11212 bytes
SHA-256: 64bbc082e2e446a5f4a8bdfff9291216b17659e8fd7c90aeb33cef093fbbc016
font_01_sfnt_off0000d477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 19860 bytes
SHA-256: 1dbca14adfd3f69638132061e5f5e29267d22f95295257d611f68881ecc531b6
font_02_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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