Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf82e165fa533af…

MALICIOUS

PDF

72.8 KB Created: 2021-09-27 05:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 67b0b2e0d6ad021e74713914f5e57096 SHA-1: 5a643e01d6810e101bf280eb822d49b0f6d7cc82 SHA-256: fbf82e165fa533af4e73b06f2d3072992179b5dc25ddb7bf36eb4743ff21c747
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://buildingexpertsdirectory.com/ckfinder/userfiles/files/gavilofizunu.pdf In PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ed12e91b1b64a89d2ff87c9859c6cc2f/tibafirijedanukexejakewu.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/59895463029.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/pulukadexuxaxumamofiferoz.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/52625269809.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/67253855357.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/sitovizisapetafu.pdfIn PDF document text
    • https://aventuraholidays.elladatravel.ro/mm/file/doxudiwapavenilisori.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/gajobasi.pdfIn PDF document text
    • http://yibetter.com/data/files/46728304742.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/60636970765.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/wugirigewaxuwogetajawuzut.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/32846872434.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/9128425560.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/wujorixonopalafujug.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/vetojoruvipunelekulu.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/dipikuzinifojusozaj.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/finofa.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/wodezaxapadezagar.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/71875545137.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/59699020713.pdfIn PDF document text
    • https://kimansion.com/uploads/file/jemur.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/relusedazin.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/43800067343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+add+vpn+manually+in+androidPDF 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_off0000b770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB770 17808 bytes
SHA-256: 64fbd788daed1dc6b902bb91a439e539c35ecc163c724c35d91c4d0bd92baf53
font_01_sfnt_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 10608 bytes
SHA-256: 00a3d27c0c40adc13c45ca555af914b58ad0d48a5934f7be7ab17b7d6a49c0ab
font_02_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1