Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5c83801b790b51…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 03:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06f5132e466304b83ee0881a15e8b00c SHA-1: bb371f76186e0bf1131a0c0c0ef483b10355a07f SHA-256: bb5c83801b790b51fdf495e1ba4759e163b604f49008cef2230a31169c74db48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, identified as a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=crash+racing+android PDF link annotation
    • http://heatexchangersolution.com/upload_fck/file/2021-9-15/20210915171357265518.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/18232739240.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/natisojepasewupozurakol.pdfIn PDF document text
    • http://flomojapan.com/upload/files/21545821277.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/befawejideludonije.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/fumajax.pdfIn PDF document text
    • https://pindimana.in/uploads/file/28588850558.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/bufufuxefuxukudo.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/bowofidomon.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/siberexepapewevawalum.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f502cf6c---mogojifegizegapirumi.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/9925733667.pdfIn PDF document text
    • http://harlit.com/upfiles/file/zafixegakixa.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/nitulisulitaro.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-16/20210916050044700153.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/96206273945.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60287fc25---tokoletakomowiwiverimu.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/12152014817.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/kekigozigejakit.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/lupijamonazatitofam.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/rukatuvoligimebiluxata.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/87645588733.pdfIn PDF document text
    • http://njchemland.com/upload/files/lesazajojozifamuwumoli.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_off0000d4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 17220 bytes
SHA-256: c3b4b6f59ad958a066ca0ad0da506f69e14ebb4f18b6af5eeec6053e8b0209d1
font_02_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 10404 bytes
SHA-256: 14028bfe4b047d4724a13b6a6800e75d3da81429b1cf8c624293903503d6ce41

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