Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb554022005bd23…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 18:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e441e193179905c223f8232888aceba SHA-1: 6591c5d35418f470bcaba2df97c1c00ce6123c76 SHA-256: 0fb554022005bd2363c9ad819d01ec9d7fc323d360068b72274fc0caec7a4fa0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to link farms and disposable hosting, strongly suggests a phishing or scam attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://soloparamideco.com/js/new/fckeditor/userfiles/file/wutopuba.pdf In PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/ruvaletatukilatomulolidaw.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/68545071423.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/59873972473.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/bivegozonuz.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/25091580677.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/7656247768.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/63730942539.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/bodeduwuzorojowefazob.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/wagusoji.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/gasozojigazudix.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/27715690418.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/75130825979.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/37951446173.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631232769.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/xadubalu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136997006422---71891003924.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xeleduraxukojofa.pdfIn PDF document text
    • http://freeorden.com/media/file/64476413552.pdfIn PDF document text
    • http://fourfoods.com/images/files/tisemexupife.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-6/20210906150056136497.pdfIn PDF document text
    • http://allycatering.com/userfiles/56656198017.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/gemajavomepesesiremagij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=castlevania+aria+of+sorrow+apkPDF 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_off0000bb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD325 10624 bytes
SHA-256: 21de7a613a78272d096fd0120dd473a6bf065b6cd642fad01a85217b40f337f0
font_02_sfnt_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 17020 bytes
SHA-256: 9fbff6d8bbe26510b09e4754a7e2a7cf981381e7b2ecee2f64f569e0ffd30f71

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