Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2c56e9ba7b1ebf…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 22:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c4a0ffa8e3de2639df751d7a020fc20 SHA-1: b5bc0f898a634ce010f5dac61fcfa138422e9822 SHA-256: 9c2c56e9ba7b1ebfe08d1d8fdd77b47ab67fef470843468aa212ba9d6eeabab7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=how+to+watch+chamber+of+secrets PDF link annotation
    • http://jingkangchem.com/upload/files/repikatedifagiza.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/27788144604.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/65893017188.pdfIn PDF document text
    • https://magerp.org/upload/files/guwivi.pdfIn PDF document text
    • http://acril.ru/ufiles/files/44031804819.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/51189057836.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/89939785322.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/wisalo.pdfIn PDF document text
    • https://krusomying.com/data/file/97414311678.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/8606379726.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349a555f554---gamijipidev.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e32817095a---42454028724.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/mibasujalupumorazagulebil.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210906220739.pdfIn PDF document text
    • http://mayjack.com/upload/files/kozigupebuja.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/pidexewikejebalumetadiz.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/fuxiduvijirudimexoxip.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/55627864319.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/ralizefexiwozobesunufi.pdfIn PDF document text
    • http://labradory.pl/file/36001143302.pdfIn PDF document text
    • https://bczenekar.hu/files/file/24741149505.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/fotiritulidizuvumifonovi.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/xezukewutatogeluxasewek.pdfIn PDF document text
    • http://sartor.ru/upload/files/rakonesunewigepi.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/72582199956.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/wimamerasajapopubilema.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/fubodug.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_off0000bb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 10576 bytes
SHA-256: 9e9fa2a835e45cbcf8be61c3c67c3453b50f4b33161432b7a6652986934e793f
font_02_sfnt_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 17592 bytes
SHA-256: b0e1946b49ab3881361e7235f1445dd616da35333139a5c4a893acdfb1d7ea3b