Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b7cf8727901984…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 20:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 093037eafb9d2dcc908861eadfcde159 SHA-1: 5f37463fa3c533c1f974e8b8099d38efb12c9807 SHA-256: f3b7cf8727901984af55c86c8d2407f77bc0d608321ec7470d16867406108cb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The numerous embedded URLs, many of which are structured as link farms with UTM parameters, suggest a phishing or malware distribution attempt. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=naruto+senki+1.18+apk+download PDF link annotation
    • http://tuzvedo.hu/elemek/file/30104429130.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/witufopa.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/53735856280.pdfIn PDF document text
    • https://phm.vn/upload/files/lenapeziwijunoxamu.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/tuxabigilaputenadosu.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/bilixuji.pdfIn PDF document text
    • http://flomojapan.com/upload/files/piteradi.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210904_CBBB8A99590DACE6.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/nixebugulemodid.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/sizazuwasaturavukive.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/ralisidaguzagimugotevimek.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/48669851118.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/59188846055.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/89126858040.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/tipegokana.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/nanovasiluka.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161418042d3ae2---lepogalagalujaxaw.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614588a8677e7---39063294832.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/97652662884.pdfIn PDF document text
    • https://brakos.it/file/fexidefej.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/fetopisezuz.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/93909930141.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_off0000ad42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD42 16308 bytes
SHA-256: 8f683872b634302b62698dfdbfefdcc1255a57d1c33244dbc49e487be3412374
font_01_sfnt_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 10968 bytes
SHA-256: 7e3f6f80683be5f73fbe7ed7c01a27164a0d3d698859935612cdccf4f9b69f4d
font_02_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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