Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0140ef7ca08513…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 15:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 059c4d466ffd94f6305d58026a440baf SHA-1: 3e39cea1f7a033414d05335435597933bc8d4d62 SHA-256: 7f0140ef7ca08513fab5087f0485ff720ca51a143c63330be026da4df94e808b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded links pointing to various domains, suggesting a phishing or link-farming scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://oniceh.ru/uplcv?utm_term=iptv+url+tester+online PDF link annotation
    • http://cmcthailand.com/ckfinder/userfiles/files/ledetonosineg.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/vogefisobajuwobut.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/jujunuxubagagunevito.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/jukomivelifeloxinar.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/sobasafan.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613735aacfaa3---7712089173.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/nutusiditogurulaguvaza.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613737610bb66---xufipemaduz.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/27347111247.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a14bea428f9f19340a8935e28b253900/89695849532.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/91173219446.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/42452227752.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/5111220277.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/dipaneguzetuvenofadu.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109090159078436.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/53405168436.pdfIn PDF document text
    • https://carlojans.com/cms/file/39883649757.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/1683052001.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109060244237644.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/vanuroxiditatotiwo.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/degevisuzoxomogejemazuxe.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/kakupibaboselo.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/polibikaruvoguvawimox.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/22118020163.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/41671813531.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210901181530.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/62375829173.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_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 18748 bytes
SHA-256: e5ab0ece4417e65a16908e58d60f385ce57fe69a5b5b4eb2f84c91679ae546c3
font_01_sfnt_off00010631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 10200 bytes
SHA-256: c4f84b2c822f6e621a039aba3145e136b64fc0ed52a9bfd46331abe1d0c697f8
font_02_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1