Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc52750cfe2a074…

MALICIOUS

PDF

86.8 KB Created: 2021-09-10 02:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b1fca4c84e7ab8e0a8cd93811a93c10 SHA-1: 1fdfc61725daf3b733d871c5f9eafb09f6161d8e SHA-256: 9dc52750cfe2a0745a7ca4058defaa3ecdf61743b28b4a2cbd12f016ce4acea2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a high number of external URIs, suggesting a link farm. The PDF likely uses JavaScript to redirect users to malicious sites, potentially for phishing or to download further payloads. The presence of numerous unknown URLs points to a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://rireenfrance.com/images/upload/files/45379376932.pdf In PDF document text
    • http://sjhtractor.com/d/files/71253840174.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/sozogifisegofi.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/mumofevosofal.pdfIn PDF document text
    • http://egitara.com/upfiles/files/60735885552.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/wavasetiwamoliz.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/79459230860.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/23155480833.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161319c7a85dac---93635475386.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090305011373499.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902132239134797.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/37260253738.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a95096d7df---17360886824.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/tolibugetopupumawosi.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210902114956.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/gulisojarokeduxo.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/resenuvasegobep.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/febavike.pdfIn PDF document text
    • http://hbaoge.com/upload/files/bogudikufapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=spm+standard+progressive+matricesPDF link annotation
    • 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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 10952 bytes
SHA-256: fcba35fb55930b5b9d96eb02041129eb85750e7e6fddbc59ab5304b77429307c
font_01_sfnt_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 18500 bytes
SHA-256: f9c32800c1be42405237270bb1217d82a2ccdb5ce0f9fafaada08099d2f857ad
font_02_sfnt_off000135f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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