Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd83e39ed399537…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 11:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcfa788ce964dfa5c4ee90e3df0371a0 SHA-1: 12e3fe2a664cd3b191f4afed1302f89b7e275f17 SHA-256: 1cd83e39ed3995374abbd7f5321a6b63680266323fec74866821b39f0f714dd4
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 external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://inwebjor.ru/uplcv?utm_term=the+truth+about+keeping+secrets+pdf PDF link annotation
    • https://dichvumayphoto.vn/webroot/img/files/zoliriki.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/pafegudagawanewir.pdfIn PDF document text
    • http://waypl.pl/upload/File/jexarowolefuwemadafipul.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/18671415871.pdfIn PDF document text
    • https://clickbox.ro/images/file/81838153419.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/sunufon.pdfIn PDF document text
    • http://anpo.vn/upload/files/23058652902.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd672e2c60---28037396902.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/durojolewasidokeriz.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/98337507118.pdfIn PDF document text
    • https://edex.co/userfiles/files/14763239306.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/98140413351.pdfIn PDF document text
    • http://umhouses.com/uploads/files/10048773470.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613009ca90571---dukamajaniteruzixixi.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/givinafis.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/83979656246.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/2322982102.pdfIn PDF document text
    • https://triosms.com/userfiles/file/topupepatulutog.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/vupupukuxilifopelepekune.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/xipenunonapagoxozerisu.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109052307318415.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_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 11148 bytes
SHA-256: a395182965ba3dc4cf38b434733949870200b3bcbe6a7563706f743ed36dee7b
font_01_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 18560 bytes
SHA-256: 9dfee3bedc66343e7f5c7d3cc5f08188ff777ce9bfc2bfd3b6645d9b2bb6ac14

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