Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bd5b6193cedb84…

MALICIOUS

PDF

67.8 KB Created: 2021-10-01 10:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 69feb09bb32f29ef3dce9cd0606c3fbe SHA-1: 8995338f345e4e345635ab771c2b47372aa50ef4 SHA-256: e8bd5b6193cedb847603370f7b057908eccfbc430820ffaa5193f1df00d6a973
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs, many of which point to disposable hosting and are likely used for phishing or to distribute further malware. The presence of numerous external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=soft+key+back+button+apk PDF link annotation
    • https://mangalargalux.com.br/ckfinder/userfiles/files/pegonafoxevapawakup.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210921033531.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/mulabiv.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/93343147861.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/ruvupibusibozelebada.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/71149192679.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb04df4f79b97391b8eec4e5bd0c536f/75641930835.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/xozasakerasazew.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/29939631129.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/wixufalalo.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/87984745774.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/98872872276.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/28452564468.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/keneredi.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/kakipowu.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/genugadosagudelevo.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/669640827.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/dotupazi.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109172359394160.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/kabezav.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_off0000acce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCE 14592 bytes
SHA-256: b25f5b53b1f6ea0695493cd147e836cb9b1cc75a2ff94066fe7c8c9629e5d767
font_01_sfnt_off0000d1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 10588 bytes
SHA-256: 4d9f8db6eacd1258875cd67aa5ebc6b99b4327ac2444557d6b91d22dc8d7f888

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