Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85e97c4e8a42571…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 03:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d4edccf64415f0306c9a52dac001c04 SHA-1: c3fc817e2c1b19c42fe3394ea3a1e7e10af723dc SHA-256: b85e97c4e8a425716c8e4462b6369824eb4eb57ae90253fba0068342faaba5ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded URLs, many of which point to disposable hosting and are structured as link farms. This strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature. No scripts were extracted, but the extensive use of external links indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=how+to+use+firestick+app+without+remote PDF link annotation
    • http://lgassociates.in/uploads/dezirimozarasoniba.pdfIn PDF document text
    • https://projetovm.com/uploads/files/53848534147.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/kaxumom.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/34736399846.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/27752080651.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/38546540833.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/78251015857.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/b02ec5a3762e1f817c5c64f74e052efe/wumogurisavuruzegadizof.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/95093968425.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/7426655472.pdfIn PDF document text
    • http://195exim.com/datas/files/45022822562.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/72839357636.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/zuwuzomigapa.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-15/images/files/xopegibenoliwawun.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/jojipemavovu.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/59554039840.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/kafapixag.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/fovovibojopemunokudo.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/52987964782.pdfIn PDF document text
    • http://suurelepa.ee/data/file/63715796170.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/87551795816.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/laxewidu.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/24231165304.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210903134808.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/55048026649.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_off0000b0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CB 10864 bytes
SHA-256: a76d030735e986cf6bfc9cc49ea65b521b773c5ed1d0dcfeec4157dbf632c63b
font_01_sfnt_off0000ca04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 15108 bytes
SHA-256: 45abd8f829ec5326bd9b987bad807cbe25d9ad59040065ac6cdbcbf0d54d0e7c

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