Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7de3b1f8a1e990a…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 06:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b4aea5904c7a6c538785f49d88d6c21 SHA-1: 5c6e6a1f714dc82c524e4ea9aedccd3d0d4ffb88 SHA-256: e7de3b1f8a1e990a77668db25d97abe38720710a2b408c1b1015f74eaabd7de7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=death+note+movie+free PDF link annotation
    • https://weilaimachinery.com/userfiles/files/wobajutaze.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/11227712679.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/lexijerusidodikolideler.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/julipodez.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/suwugukijubotuzomixamoze.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/81501992684.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///rejugavovarov.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/rexiduwidonaka.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/87823556779.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/17154223827.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://nemalipics.com/vumaza.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614062d00b2d1---zuzakuraviwusokav.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210917230108.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/31144318186.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/nuzolorenum.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/nopogazevaxizoxobewolaji.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/relomidanewif.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/81689329313.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/sukoxedomikudukavogiral.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/tezinug.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/baxakazagefoferes.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/denufabuwu.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_off0000ae63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE63 15716 bytes
SHA-256: 07a8997dd2410720526c03cba7f8f02d17dde1c14710aa139efc0434637a9590
font_01_sfnt_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 10332 bytes
SHA-256: 23cb14fafe2221f5a660f0933e9fa3862ba44a4532c721e96c62489c26f025a3

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