Malicious PDF — malware analysis report

Static analysis result for SHA-256 52712d9dd1ccac60…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 21:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 47e54866f8361b44e6a9ae4379008ffa SHA-1: af0811bb68b1647f92af5fa9227cfbf70d8c2bac SHA-256: 52712d9dd1ccac60cd4b7e302e53db1b0087280cc8cc3a330039a616fcc94614
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=pubg+lite+apk+obb PDF link annotation
    • http://bptramptour.pl/files/file/44845948474.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/jodupewelulijomarunuxubo.pdfIn PDF document text
    • http://fourfoods.com/images/files/xizaxowaxesapujorutos.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/73829627295.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/25740244837.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/zewumawefuvi.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/4928565646.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/12284978679.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb839e7d98---66860876975.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/11488612120.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/15849673298.pdfIn PDF document text
    • https://nevisnews.com/userfiles/vabab.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/nipufuxapuxoji.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/79098208894.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/5391140924.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/wefipetite.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/powisinivuvozavafimitu.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/senegolurabosapabeje.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210916145429.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/sukunejasob.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8d8b88152f5540c3300ca72c08bfa945/gupozogov.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/libilalonuzu.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/38667243911.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_off0000c7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 10388 bytes
SHA-256: 2c6a5a075c7a69e163ed1d95a1866603364166bbc2a4d8fee25f63839e75427a
font_02_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 18744 bytes
SHA-256: fb7eb13cc5ff5d6e22e3fe06f469fda85e803e2c3e39cf3402b4dc719d829d8f