Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48e179b2f739830…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 22:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48827a1e0b6e6ad3a1d4d8b3df14be4b SHA-1: 89a37705041e19bee6666db64034fe358ea94d4c SHA-256: b48e179b2f7398304bca6c87089102a0f23c39aa021c277e88a2bcaffaca742e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely serves to redirect the user to one of the numerous malicious URLs found in the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=fitvate+premium+apk PDF link annotation
    • https://matteagianotti.ch/userfiles/files/jezutovi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hdfa7hhekq9kus78ha6co41bd6/38233281327.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/fopatade.pdfIn PDF document text
    • http://jcpingie.be/public/files/26155960544.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/pigesowidomotivajikixad.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/17m6m2ers9v82lvmh64eig8s5p/zavokodiwuvajekanimoziluj.pdfIn PDF document text
    • http://zenithmetals.com/files/xesodutakisubij.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/wemugobilulavinokajimamo.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/milupipeju.pdfIn PDF document text
    • https://kultmotor.hu/images/files/legorunagumajegovuw.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/69564774949.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/bunimalugigodopenivuv.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090707022773499.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210905042818.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/pawaxolenotukovonemavate.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/67341687139.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210912_7CFA4E9D4DF8D2FC.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/joxinafelabuw.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/20298569746.pdfIn PDF document text
    • https://ksboutlet.com/file/files/35951081811.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/59860030936.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/jizedadosu.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/rabetunanuxesoxarefek.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/18120183963.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/likesepiw.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_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 18256 bytes
SHA-256: 7ed5464c149b0fc61288c878eecd3493123112c3dbd323563b825ca56368a70f
font_01_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 10208 bytes
SHA-256: 4e6db3f1d4dbf5f76af6c9f80b4bb4ed274cdcb4e2a57374be1ddc7b693456fc
font_02_sfnt_off00011fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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