Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0eb9dc9908a2636…

MALICIOUS

PDF

73.6 KB Created: 2021-09-24 21:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b452e331071682934d9d001832d9534e SHA-1: eb595f275385f541782ee340dc03bc4e6f1becfd SHA-256: f0eb9dc9908a2636abfa0670410136ebf80ac66c6292273cc742a32a4533599f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely as a first stage of a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=how+do+i+unblock+a+website+on+chrome PDF link annotation
    • https://holocaustresearch.pl/nowy/photo/file/rinifadadax.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/6629310213.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/votemit.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109120406591821.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/fegonamirotudofetirebus.pdfIn PDF document text
    • https://alutat.com/data/file/67311200540.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/656531e8b1e78f9c4412e4d912e0db92/53066523747.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/mugod.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/xezavizufedodanafomowuxup.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/37415826877.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/donepobi.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/74286158775.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/giwojeju.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/5576328316.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/33842139582.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/61137776720.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/pajun.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/vobadu.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/zimupim.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/sebadujivubefom.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/3656699115.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/78813319536.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/jebesusoler.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_off0000b6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A8 18996 bytes
SHA-256: 564ec3f602991ccbcbf3328f225f3c0275677def23607973ee19f8aaadf2ff16
font_01_sfnt_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 11044 bytes
SHA-256: 7a7eb499df0323fbea3f63e84570d09e4738629ad859ecb25086f4d785b19a99