Malicious PDF — malware analysis report

Static analysis result for SHA-256 8faf99e5a45b9549…

MALICIOUS

PDF

74.0 KB Created: 2021-09-15 13:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc45ec15d9ce7e576d2eae3c6d3c93e0 SHA-1: a5e85459b7d903b98fb7aad7e0ac3564fd4c71db SHA-256: 8faf99e5a45b9549daf56c1a6afb24c1efccbd708ac1b560c3004d9eb89d53f2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host numerous links on disposable domains, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://inwebjor.ru/uplcv?utm_term=watch+it+2017+movie+online PDF link annotation
    • https://pmapmc.com/userfiles/image/files/lisoruwiwamigatupano.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/reginepewosizadupuwe.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/demudidete.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/dizewazimuparagoba.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/9252913423.pdfIn PDF document text
    • http://pactolous.hu/upload/file/65616077875.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/tujojo.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/tudixanamadavo.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210908122629.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/kavamilopu.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/98887589158.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/mojevawenag.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c42154d12---38673519248.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd60834d5f---13291539836.pdfIn PDF document text
    • https://jin-ji.com/upload/files/fagago.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-13/20210913212635987096.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/11658979274.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/22329022139.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/wogaxuladazedi.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/25767213145.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/kixijexevejes.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/fimirazegabex.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/veruposajimepekat.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_off0000bdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 17280 bytes
SHA-256: df2e5086caab1b1fcd3a9f39f40be8b8a1060cbd3ea5376619aca17eb0bbe5dc
font_02_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 10632 bytes
SHA-256: 95c14ffc9a72e6949d1f81c15ed2230b9a0e50563a3ebe24c03041fd4daeabf1

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