Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cc2fff6c93ddfd…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 04:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ec1677e0bdcc33e8761f7c0898b58220 SHA-1: 48c7bc0e541cf939f2af477f0a95ccbfc642ff30 SHA-256: 83cc2fff6c93ddfd87baa643bcc43e68768c8974bf0e86f93db1e169538a3d72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which redirect to other PDF files hosted on various domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead the user to malicious content.

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://hankilfood.com/upfile/files/44346564748.pdf In PDF document text
    • http://vagtteam.com/userfiles/Files/60835690004.pdfIn PDF document text
    • https://krusomying.com/data/file/88293549593.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/fugeruju.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/82312210953.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dafumemeleg.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161385c9f28251---sudegubevajat.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/kemut.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/sugiwuwirope.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/5dd891cb13af2aa2f4b6170c482027f2/xetewimevufuburene.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/lijuxakekasozuzibati.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/zebuxalijagaritorupi.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/mipolepimejugemeg.pdfIn PDF document text
    • https://bak.vn/upload/files/kinasu.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/kojaxive.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/38164437074.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/kaposidizasix.pdfIn PDF document text
    • https://airxps.com/userfiles/files/82733223080.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/nanopuvu.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/zujiselalubamo.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/donegirivukized.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/jumibapake.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/zigedogaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=my+city+new+york+apk+download+freePDF 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_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 17524 bytes
SHA-256: de8ba08b06e9ed9f2800e79df8370f3c5339a4a1b6731142d0db4955c208840d
font_02_sfnt_off000124bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 10732 bytes
SHA-256: 6fe55107c777874a2a48cacd5470242ea750d3293a26bc5fec3032ac4d9d7f0d