Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbc0270eff11354…

MALICIOUS

PDF

73.5 KB Created: 2021-09-25 01:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6029f1cb5563634227d506247c2032ba SHA-1: 561b5f21a7ebbc466599d868b7028099c9789f99 SHA-256: 3fbc0270eff11354bb2db034de8ee683c9339248964a62c52e10829a32447087
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, indicating a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://cokhivietuc.webthoidai.com/img-vietuc/files/69241293879.pdf In PDF document text
    • https://mosallaesf.ir/uploads/ck/files/gugel.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/26331754983.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/63757287961.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/11466677087.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210909_193018.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/kabogetakegizefuk.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/telitivid.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/75468784687.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/71580491546.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/javikitegavidovobax.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614074bc92ea6---44645703256.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/nulidolopel.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/21630214068.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/saxokubanalukirowemumo.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/99232925880.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/90189382477.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/xodemorem.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/19631681765.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090310200373499.pdfIn PDF document text
    • http://annabarons.com/files/files/53758117838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hack+baba+virtual+space+apkPDF link annotation
    • 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_off0000b2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 10532 bytes
SHA-256: 747b57d0402a391511e505c5a205495f84b80f0dfbfe3585c2fe50c84e68c5c1
font_02_sfnt_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 20888 bytes
SHA-256: 9f178164306fa2c6f0672cbf9bd2f727339f118d21218ec748cffb7f1af216a3

Open this report in the interactive analyzer, or submit your own file for analysis.