Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbf0f9517385352…

MALICIOUS

PDF

85.5 KB Created: 2021-10-12 01:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a56f8400469b17be3f1ed8df3975af00 SHA-1: 2a41b075856b95e96d75a5610394d79d84f80bf4 SHA-256: bbbf0f9517385352d63d1eea4bbb56d45f67ca1d7f24730802538b0967a9ca75
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs pointing to disposable hosting, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate the document's purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=wood+sitting+on+a+bench PDF link annotation
    • http://premo.at/userfiles/file/mimamelopinataruparipanuz.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109010515211003.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/61778491330.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/17999793358.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/93705098388.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/rowosutuwezavupataxop.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/57844519190.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/jixoxusofi.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/vuxivadixizuz.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/63675997187.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/95912852223.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/nivikozidi.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/zikopenupiludexiwuluk.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f59d50a4c3---74410046472.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/zalobavutotapalajojiv.pdfIn PDF document text
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/mutusijopemosibazesikug.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/jukagoluvumosuliwipe.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/wudofom.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20211004_005119.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/22164249364.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/dodemi.pdfIn PDF document text
    • https://hoalavender.net/upload/files/gujagujuvizuwalurak.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/85442427142.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/20026925025.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/nonegowi.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_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 19008 bytes
SHA-256: bf323a8435fd40d8735eee3875b3aebd225384353a83738f09f3eef38f318481
font_02_sfnt_off00013003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 10636 bytes
SHA-256: e47bd90dfd025604c50727a77bac9abfbf416c34ad1919a4e20e5d0b5297eb91

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