Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf60e1dc6a53d7b8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 15:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ce59239693796796b6f40393cb6c6fa SHA-1: 4a04db84575bc16d520806411297f391af61c397 SHA-256: bf60e1dc6a53d7b87895cbdb70159b7ac82563a04fa001c856df7f3a5f397a13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=browsers+for+android+mobiles PDF link annotation
    • http://bimbrlata.cz/UserFiles/File/muxizagowetar.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/sopako.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/radanaber.pdfIn PDF document text
    • http://husplaza.hu/editor_up/bevagelusewinopovepaxire.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/1541919027.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/degovujatoresujizexonur.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/52648681493.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/fexodufe.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/poruduwupedubipadexileme.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/72433636333.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/siwipudazisakexolobuk.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/14086910497.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/8726cfeaa674f7c67b3c5fdfc7865705.pdfIn PDF document text
    • https://ghnservizi.com/file/57131683609.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/fovaravuvomuluvapiso.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/14962325960.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/79862334989.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/17606635364.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/jafudusodokexelug.pdfIn PDF document text
    • http://furniture83.com/upload/files/51593862208.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/95162501742.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/22730481516.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/setesunenugalaporudoben.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_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 10696 bytes
SHA-256: 43e2b5bf2f642969cfc0d3c769a1b0591356a948433d5199b6fffb3187c9a1f9
font_01_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 16588 bytes
SHA-256: b558cdf9c64dc602c6757d49c46ee833bbe449baf9d1d5302b6362c965c05ecb
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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