Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12677d244f4594c…

MALICIOUS

PDF

73.3 KB Created: 2021-10-05 15:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 843cc10692702159afa1bf2ac27d0b54 SHA-1: 527ac61ec77bec29db346105acfa5f864c02449a SHA-256: f12677d244f4594c272a81719baebbf0bf804fe1806aba54b2c90393f7571330
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external domains, characteristic of a link farm used for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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=intentional+torts+outline PDF link annotation
    • https://comobrew.com/newsite/images/user_uploads/file/86934065559.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/3416066964.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/jasanotowusalutumi.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/zejitupu.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/wagepugisebu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zejeworibonenob.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/97021529800.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/xudotobotuludatodixo.pdfIn PDF document text
    • https://thaodienland.com/fckeditor/editor/filemanager/connectors/php/temp/file/dudakosopixovafapexodika.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/raduj.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/92100581802.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/29301070305.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc63e1a131---38647876655.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/16993910649.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/vimezibosopak.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/likegogapokodazanixegi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1181e1856---49665132357.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/wasogiwodalalagikerenewi.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/16812522665.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/88603961282.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/76064285341.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/nuxanikomaj.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_off0000bdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCB 16592 bytes
SHA-256: 099f326d3baf2d383adfefddf97a85bc60abefa4a2c8e0623b99e99f8a1ede90
font_01_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 10152 bytes
SHA-256: 5650709f1f5ac61010d081fb58c370c8957c69c18c0eb5df64de7d07b1731918
font_02_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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