Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af0f1bfde37bef9…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 07:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eecbc09853d49624e348921724ae880a SHA-1: 805a7b7ffacd519d38cacc1d7b5af4a335698852 SHA-256: 7af0f1bfde37bef96be713a279d3688af9a9bc228506b4e8c857a5bf89d52070
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://st-johnson.com/Uploadfiles/files/37577425878.pdf In PDF document text
    • https://12shio4.com/contents/files/67504959741.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/gusiluputa.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/doxafovubo.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/50169300296.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/pozogisepokokax.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/72299359000.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/76539477010.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/zupadoxef.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/xezogo.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/wuxirafepiraja.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e091a759c---47998929709.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/92580768787.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/mewutigosovuzegaraj.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/11365167005.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091010101983.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/laxizudakatowi.pdfIn PDF document text
    • https://motecx.com/images/file/mafezufuwiba.pdfIn PDF document text
    • http://artio.pl/files/files/polobitebowamanebosev.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/71109663730.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210907_232038.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/93693479151.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5464641ce8a441a02f2ac3fa1d942a72/diwugu.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/17925858786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=two+player+bluetooth+gamesPDF 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_off0000b37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37A 15216 bytes
SHA-256: 050275ba5ae15d2b21884f62c753fe933aef96eadc1247fee72b3a5f7d58fdcb
font_01_sfnt_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 10908 bytes
SHA-256: cf442ceda3984155205341a5c225bf8aaf03d1f09a5770a9275bddbc4c951bf7

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