Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74624ac62ec8d8a…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 15:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a0199bee57681103b559f4b68cbd7e3 SHA-1: 83b6d5f3565525b033b33b4a2a5b81b52088631d SHA-256: f74624ac62ec8d8ab91ad0d3e7f8e5e5280ed75b1b18f18f1059389fea43eee0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://tivirtual.com/userfiles/file/wobaxobizugekapidimemanev.pdf In PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/mimepekaxitiwumusok.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021092413020373499.pdfIn PDF document text
    • http://ccshecea.org/upload/files/faxuronarurerowerolopuza.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/mizuriradesevezamu.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/nuwejowudi.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/dolopuromude.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/39301685430.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/16800489522.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/86150546143.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/17759236647.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd8ee698a---857888635.pdfIn PDF document text
    • http://linker-apps.com/files/66399826632.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/rizug.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/27574866665.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/xoviloba.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/dulabivonireza.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/guzazuxukodatateji.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/57214903017.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/sanedijoramenavelu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a41cb7639a---dituxemixufutijubod.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/2066098432.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/70871206951.pdfIn PDF document text
    • https://koratspring.com/upload/file/zugejo.pdfIn PDF document text
    • http://totoumi.jp/upload/file/sexira.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/satuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mary%27s+mosaic+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_off0000b41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41D 10540 bytes
SHA-256: 4883a0b2c2457b2042366bfe60c35a96cd56096d92bb9f7645012623a1a032fb
font_01_sfnt_off0000cc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 15196 bytes
SHA-256: 6e9107f513c0957f614653104adf239df9408bf694fd33f5085bf0546a04be47
font_02_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1