Malicious PDF — malware analysis report

Static analysis result for SHA-256 5454db408a4e8f17…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 18:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13d1b33f1ebd49edeabfafda6d52325b SHA-1: 9fd394d5acaad4190e9a6bdefafbbc9f4fb7c015 SHA-256: 5454db408a4e8f17b852fe18b51cbc5d89f73880b8a7a2580784c623107dc2d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a fraudulent phone number, consistent with callback phishing or tech-support scams. Embedded JavaScript streams suggest the potential for further exploitation or malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://108pizza.pl/uploads/userfiles/files/tosunesizuwijumala.pdf In PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/80634223300.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/zevijalaxurefik.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/6731035172.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/50273973810.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/68643089699.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/32655981424.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1402b0d57---zewodusux.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/kuvaruwu.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/kisizerur.pdfIn PDF document text
    • http://rsentco.com/upload/file/80223133893.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/76596847350.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/13054267366.pdfIn PDF document text
    • http://agama-rc.com/upload/files/bivodesoboruvivozokaw.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/korajenutonupemu.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/fidikafode.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/jirotabenepubej.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/89463094633.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/32224950276.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b5e1c28ff404750158dd22bd0cc78982/1393116649.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/27153028980.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/75708532852.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/buperitodexetit.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/95233416400.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/71227902783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=vudu+android+tv+appPDF 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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 18672 bytes
SHA-256: 9b8e754d6f07df6fa39ad4201235c33d99d8250cee7d94923850d2780e518bce
font_01_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 10172 bytes
SHA-256: 73da3d005feaca5f95775f2b5939ecebcf3794ae37e6ea6c1962dc0a974bbf6c