Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9eebde66d5c4291…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 16:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ef2f8ee0f682a2af393473062ab96a4 SHA-1: 31e5eec13b5ac3bf6ce0c7df919db12cd24ca706 SHA-256: f9eebde66d5c42915a9724242757ceb1e0783a8dfc9494abd340280f09dcca1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to direct users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=how+do+you+do+facetime+on+android PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d3c676da---67828076989.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210915_BD3E4AE4FAC55064.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/60111873374.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/233963674.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/9918250108.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/wutana.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/lujelabuxupaxopisuzogev.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/xufulameregedimasowanoto.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/zafekej.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/lomadojimixodepal.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/ganamunirufegavoxovunipa.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/58492069762.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gasol.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210915165323.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/papev.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/89002229174.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/kofitup.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a43564c2---wuminudevax.pdfIn PDF document text
    • https://campermagazine.tv/public/file/lixisavavanavogumimowof.pdfIn PDF document text
    • http://asqcert.net/files/files/jisun.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/zemosamisomuzo.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/23758213617.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/wabesuvevapowaja.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/43587589304.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_off0000ba6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6F 17084 bytes
SHA-256: 46c517067e3fe8fca30e18dca9516efa72a129e1445894167628196f94b5614c
font_01_sfnt_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 10712 bytes
SHA-256: ac02bf6cbc71e04ec6763f9f13b90efc9d996ff286d14057729d75c2195cdaef
font_02_sfnt_off0000febc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1