Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4f8eac068a273f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-22 20:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 656cd179337a8be891879e41db91a9b7 SHA-1: d3d6c9bd50036f2e7f41967ceb2b25535b2fbe45 SHA-256: 7d4f8eac068a273fbd7d4f340313f3d9ccf41c393ca08197487d008fe31e3f49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and one specific URL `https://inwebjor.ru/uplcv?utm_term=the+amazing+spider+man+apk+data` which is likely part of a phishing or malware distribution scheme. The PDF structure itself is also noted as a link farm, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=the+amazing+spider+man+apk+data PDF link annotation
    • http://thangmayedex.com/webroot/img/files/93835687831.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/26815150739.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/kowirumolesemo.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/pewabipapede.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/tedamobulunosip.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/53912950001.pdfIn PDF document text
    • http://groupkaishan.com/d/files/bapan.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/kudemulufenawik.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/65864922425.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/xufaz.pdfIn PDF document text
    • https://izometal.net/mm/file/kaxonemem.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/viragawolemizusomopup.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/66836302586.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/26085759461.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/72803199876.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/27815393066.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/96986224654.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139f56085e---lazosodupirimali.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/94480201311.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210906022402.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/97260762684.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/98222974062.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/94522800691.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_off0000b5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 10788 bytes
SHA-256: ac3e80ed750bd54dfe4ca33cd8640918ed6b928cce4536a7613e59b252996a1b
font_01_sfnt_off0000ce2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 15392 bytes
SHA-256: a77f97f72aca18435bcc8bc6fe7d090518b416b747ef3650bcbc8b5e26225c99
font_02_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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