Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b73a1fbbc706a88…

MALICIOUS

PDF

84.0 KB Created: 2021-10-06 17:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 359f9c283554f5cce6dc2eed1f51fbef SHA-1: 4a38b07b8f627aa4dfe400da36a3ebecf5b8c7b5 SHA-256: 0b73a1fbbc706a8830e9c4c85ad793c6b90ab448d03393059976ede1130f2778
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=apple+iphone+model+a1332+user+manual PDF link annotation
    • http://iscyber.com/userfiles/files/20377721708.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/72658353068.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/mewofajinojiloneb.pdfIn PDF document text
    • http://mi-stores.com/basketballtotaal/images/editor/file/77030181524.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/25377017114.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/dafudotelunebiza.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/robogug.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/6614432016.pdfIn PDF document text
    • http://chongros.com/userData/board/file/74407612054.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/bekijulenazovireg.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5bd401bdb---63375578676.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/92018369509.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/selajuzu.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/74187688225.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/53299110357.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/77468339365.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421aabb81ef---bojitanewufevus.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/3346213373.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/pogefugutiwapawurito.pdfIn PDF document text
    • https://kar360.com/resimler/files/xalorunifudamop.pdfIn PDF document text
    • http://fkhd.cz/data/img/jelixa.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/34781857376.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/jegodonejodod.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/bunanadilomiwet.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_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 10984 bytes
SHA-256: 276333367ef523b9d23df3d5c785e8cda4b0b7e4749b935c0f02788908d5e0ed
font_01_sfnt_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 18616 bytes
SHA-256: f8edf52d1565c5e72b77913a7f81b161270b853616518ca29a23352cfba7b6f3
font_02_sfnt_off00012a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1