Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c12de76eff88501…

MALICIOUS

PDF

71.4 KB Created: 2021-10-03 00:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12bfa1123e660e17713460f34b19463b SHA-1: ef49b3737cc5f7c4466da3fee7fcd1789d96fd89 SHA-256: 8c12de76eff885013ac3f24f41a4e8147ff6cd30af70706f18e304e31d89215d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=topics+for+class+12+biology+project PDF link annotation
    • http://champaigncursillo.com/userfiles/file/26541131956.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/bifuz.pdfIn PDF document text
    • https://ef.msfoody.com/upload/files/wafene.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/wekakapel.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/losenisesataviju.pdfIn PDF document text
    • http://domexpo.ru/up/file/ruxid.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/wimaguxedo.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/93392513627.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/20167813309.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/komarolisawotasub.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/42d7ac03d59b8201f8783342f9d16ea9/68049902266.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109161821463017.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/26495653443.pdfIn PDF document text
    • http://zuszdounky.cz/files/zumexuxozopazogifugiw.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/dusejuwadefebelugonopixu.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/65850656125.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/filubakaxesitujoduva.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210926150612.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210912060514.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/xeposi.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/83597553932.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/zinokavemajati.pdfIn PDF document text
    • https://harmony.im/userfiles/file/lijujakonikeba.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/vavanawadu.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/xilapikefazijekipoges.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_off0000b1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EA 11072 bytes
SHA-256: 90c37074e4c0e774f826baa38fcb7ec58a7b8d925445ba5ab30a2713fd2b77bf
font_01_sfnt_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 17104 bytes
SHA-256: cd4dea33be9ea473daac9000f94a8daa95242fd44119be61dec020cd9a1c4ed3

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