Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ce61da49aa0129…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 15:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c447e9efaa11c2ceba024775f926553 SHA-1: f3ec6f0e24668a5b93eab2e27a39db9673343d96 SHA-256: b3ce61da49aa01298a15908f5167141f67991ac30ebb9ceb2ec93ed2d8d321d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the interpretation that the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=husband+wife+ki+love+shayari PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02acaff5b---zasajodexinebokokoba.pdfIn PDF document text
    • http://stevis.cz/files/file/58154899667.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/91593567745.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/mebisudeputasadoguj.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/nafizaput.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/wutegumelibuk.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/uh4ocs5jn95vkhi9p7vv35m4jf/jewosofakemojufivu.pdfIn PDF document text
    • http://bienbao.net/uploads/files/41531638186.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/72815999009.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/65258533783.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/jarogegugumu.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/sojoduzenexofetag.pdfIn PDF document text
    • http://rsentco.com/upload/file/93918551755.pdfIn PDF document text
    • http://ecogestval.es/userfiles/file/roselipiwapon.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/75861911451.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/lozatopemapewojunapite.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210912_D71F3D9938B8C5A5.pdfIn PDF document text
    • https://ewt.cz/res/file/15369125366.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/6959622873.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/soxuranixaw.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/tibosototupakefum.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/jutipesepotex.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_off0000bc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD437 10944 bytes
SHA-256: a291b03179d691d92fd5b929f368476bb132de7f43df6501f3f87dfc4404a8a1
font_02_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 19356 bytes
SHA-256: e15ddc4c674bbaf8f39e15191a09abc1c6a83e21de5174bfee9e06e2fa86dd25

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