Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9041c10a5927bac…

MALICIOUS

PDF

76.1 KB Created: 2021-09-21 14:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b37473f7f173ab7abdbe7f5603902c6c SHA-1: e32963e6d68b12e6add4d5e15cd111b6a4554f01 SHA-256: f9041c10a5927bace3bf5fa82e314201ec5d021a6b9b2ea8d46a6422d89d2578
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=dream+league+2016+obb PDF link annotation
    • http://hatowo.com/app/webroot/uploads/files/widewajiwovo.pdfIn PDF document text
    • http://classtool.info/upload/files/94536746516.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/77802911366.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/tanomuvadubujisos.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/eboh4euo25gduhdbtjggeincg6/58958406691.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/17298696731.pdfIn PDF document text
    • http://www.siposferenc.hu/html/83388267617.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-13/20210913182836209008.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/24298358246.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/sodanamizu.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/40710628301.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/91932833190.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/depixagov.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/48509272455.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092005442746.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/wisuramurawewezawexuj.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210908133711.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/bonuvupalokake.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/89120538029.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/fadugutomopababida.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/60396278363.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/33458618564.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/xamoxifefugibexiwuwipa.pdfIn PDF document text
    • https://insp.biz/img/file/wunusemo.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/mobizagugivowataluf.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/44967508422.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_off0000c499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC499 10692 bytes
SHA-256: 715343d8f2929f792be68757e2d71a9efbd817f039b6914d8c992f97a9c6c11f
font_01_sfnt_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 17600 bytes
SHA-256: eee7c98f4ad3c424f4efbb1bdc4bfb751ffa848f40879bcec4b1e474cd32dbc9
font_02_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1