Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afb25320477bd71…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 08:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf1108f340dd65000ce2b7dd9af0b2cc SHA-1: a25fb56aaec0764ae6c1c6d01dd08be45b91125c SHA-256: 0afb25320477bd718b670c4daf19a084b8d2de8f5fba145eef265f9661cc49f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm designed to obscure the ultimate destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this behavior, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of the embedded URLs and the ML classifier's high confidence score point towards 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://grouptm2.com/contents/files/27179963821.pdf In PDF document text
    • https://lighthousemacau.com/html_upload/file/25356323370.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/vikavudevuzogeririjowil.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/xevuzujegujenusaranifoxon.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/xesavip.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/58086126524.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/mopapevuwumejopofamasis.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/fukarofoxuzosusanidefima.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/21269207499.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/63196923157.pdfIn PDF document text
    • https://basisnomor.com/contents/files/dusosapogefawuwin.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/sosefewalizuzopasuruzumu.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/gusalavarasevam.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/ledebivuk.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/mirusakufawizidigevubetu.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/gasifib.pdfIn PDF document text
    • http://kammed.com/userfiles/file/98925266651.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/jowositapukaz.pdfIn PDF document text
    • http://landia-print.com/pdir/file/bisukipakunatefowu.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8uif5c10jdvmsfa17ftvc00u53/suzapobowexikuzitojesemo.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109132107488903.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/84742815838.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614594a068820---32789343620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=star+combat+apkPDF 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_off0000b4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD11 15924 bytes
SHA-256: 883673c4102906bed81d8677941d6e362d96f065e4b37ed7ecedaae72ef32a96
font_02_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 10300 bytes
SHA-256: 369cae8c00335c865bd9fc94fb40d41b5d75ad3412c2a584907911566da36d32