Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0228e8ddab371c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 17:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ea243362c2c36f4402f32794109b7ab SHA-1: df3be198ec654e87e645ccd9222e630a95b707eb SHA-256: aa0228e8ddab371c42b505faef4c130c7edcfaa0dfd966d016a665c43c30f6d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which are hosted on domains that appear to be link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://ordineveterinarivenezia.eu/userfiles/files/wizadatewowa.pdf In PDF document text
    • https://i-try.tw/upfile/files/2021/09/08/fizebapesokonon.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/17570139284.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/rekinobuxenomejibin.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/pixazat.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/60715283910.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/nutinewekuzalusuruj.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/loguzoboravimodokifowaja.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/porejajutodamonek.pdfIn PDF document text
    • https://proxus.nl/file/39621154732.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/31010210792.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/88035195789.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/85749155851.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/finod.pdfIn PDF document text
    • https://kiptep.ru/file/44604217218.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/pemoli.pdfIn PDF document text
    • https://costarica4d.com/contents/files/96333066972.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/gipobawisefedubatemowuku.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210905_161132.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/tarozokedovamaduvolum.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/9073011001.pdfIn PDF document text
    • https://digireg.lu/upload/62631310964.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c7df1fa9d47edae73c1adb2915a63ea/71900336854.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/botojipabofokudum.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/rebetazorasop.pdfIn PDF document text
    • https://mfdesign.hu/files/file/kesuresutorogukewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=research+about+academic+performance+of+students+pdfPDF link annotation
    • 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_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 11124 bytes
SHA-256: dd55b6488d20a4652c561a7d23c525abffbf95167d923ed93e6d8f1a97f6d25a
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 17404 bytes
SHA-256: f29d2032392351025085e2b66dbbf98638d082ece05633c8f8f75300e59abad7