Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb75f1ed97aa68fd…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 03:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 399be775ee6528e034e03b1b90e7f67c SHA-1: 105d5db0744567e6d9eba2830643f5622db811ce SHA-256: cb75f1ed97aa68fd48a9f4c97e561cb4d1ffff19846522150820e62f46694347
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates that the PDF is designed to act as a link farm, likely to distribute malicious content or engage in SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://theaterbuehne-schwandorf.de/userfiles/file/7689287164.pdf In PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/mejerowaxopadizanukupib.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/30597954162.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/74235849809.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/97033994793.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614907f50ab07---26769867193.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41000980454.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/mopajafuwaxuvi.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/57109883353.pdfIn PDF document text
    • http://lachina.cn/upload/file/79223636143.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/26226968850.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/nijitujazatutolaxitasaso.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/kejaterazizo.pdfIn PDF document text
    • https://equinox-e.com/upload/files/fizasigezijazuzibisitima.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/20737883660.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/49407904921.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/derazufewapoda.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/93710206622.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/nozamumukili.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/vajimodagadapix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141384227eb6---88223601997.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/woxuwasawesugijig.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/97815228446.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/58665838579.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/bixogada.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/54710689395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=active+active+and+passive+voicePDF 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_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 17952 bytes
SHA-256: 769eb5f85cf64015f62e8c437c69923da60134fd4a56323c7863b68710339414
font_01_sfnt_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 10408 bytes
SHA-256: 8bc91626733fb9153d48db78dd91e83037a2301a8ad187160a4bd34b2b0bb610