Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2732a3b95fc17ad…

MALICIOUS

PDF

94.7 KB Created: 2021-09-08 16:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1af7a97ec6c9470b81fb4eaf4a68ad96 SHA-1: ef21933ded554f1d8067bedefd80fa8ea7d07136 SHA-256: f2732a3b95fc17adc1898cef357b25c0d779ed9d36a6f521957fecf8e8561fe1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm structure. The presence of numerous unknown-reputation URLs suggests an attempt to redirect users to potentially malicious content or download further stages. The embedded JavaScript is likely used to facilitate these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 http://acecaalcoy.com/userfiles/file/xumenowuzefub.pdf In PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/kiwelip.pdfIn PDF document text
    • https://jagominum.com/contents/files/rogemivowede.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/debizoloroxowosefajo.pdfIn PDF document text
    • http://delve-cr.com/uploads/gubodoxebijutipewibixakim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1a62b9cd---74218571976.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/ridebif.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0e3ddd1463f0de64f7333f5184e38898/lidevulokubomer.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/58028784088.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/rojudukutepikaniganoji.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/donarasefamu.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/jorizuzosanak.pdfIn PDF document text
    • https://cmoretv.com/userfiles/6318167007.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/diwoxojefukinixog.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/sebizobexixefezilalusugi.pdfIn PDF document text
    • http://placc.info/up_image/kategutajer.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/tajarakumavazon.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/wapiv.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/55961795468.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/27398766214.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/geduforifatenadulotese.pdfIn PDF document text
    • https://basisangka.com/contents/files/71003291952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=australia+citizenship+test+pdfPDF 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_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 10740 bytes
SHA-256: 2a94db77a9ffd122f0086fa4024c74ac09d886700101913ce056caf0beb7131c
font_01_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C18 18804 bytes
SHA-256: df557b2c8a06b27a0e3d1e9c4c08370d17772a336085d14da55f1963269c8e15

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