Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e35996470c4ba10…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 07:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e505c778546b1d7c88a042617d1d969 SHA-1: 7f41d3b0eae304368a26743e4677f8c20bd31397 SHA-256: 8e35996470c4ba107d4470c23e661d57f9424dbdc38e89820463c3fc0a93e4b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=depressing+but+true+quotes PDF link annotation
    • http://stroyindustry.com/userfiles/file/niberakopabiluwep.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/40613967229.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/pibinefafivanume.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/xadugowe.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/loxivesonejagerodu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407fac4d98e---fuwakuxobonavinasowodebu.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/83609744246.pdfIn PDF document text
    • http://klhl.com/userfiles/file/wedutaxidi.pdfIn PDF document text
    • https://taperagi.com/contents/files/lilavenoguwefil.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/47097803045.pdfIn PDF document text
    • http://iviltra.lt/images/files/38899285421.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/zazatuwimidelitoxefopalu.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/vuseviw.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210901142437527.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/dugag.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/xapeweroradamevilazo.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/btdq7ur32m45mvuuf9ip2p6fin/94616386298.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210910223720.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/gowuvu.pdfIn PDF document text
    • https://go2germany.ru/files/file/72653161410.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/refevufoxefusav.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/rolerolobe.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/88473587486.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/12204356258.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_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 18572 bytes
SHA-256: c4f0ac6a993735637c239d81150b55e027aa2d610ada46cb200dd4cf93cf4a74
font_01_sfnt_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 10604 bytes
SHA-256: b9998c7e99eb3e8122d88457e8f857cab3b4441b63ad0f54fdec799ac31f867a