Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd46114dca805c4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 07:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9bc533e35e0ccbe70629104d25553af SHA-1: 17dffb2a781b4a8826e0add05cd0b4560c90b246 SHA-256: 8dd46114dca805c43fd5ad295b8b809ddb1235a2244d727ca3ddd61f202d84d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using many redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://springgalleryng.com/Images_upload/files/21685382440.pdf In PDF document text
    • http://skpizzasubs.com/uploads/files/jemer.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/79822708927.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/bexejinuxajelofapesepa.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/98159836993.pdfIn PDF document text
    • http://netart.hu/userfiles/file/fobusobumepipiwamopuliv.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210913205042.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/leguwijejozodulorefe.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/36190061512.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/vavavesuvolep.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/20984963433.pdfIn PDF document text
    • http://synphabase.ch/upload/file/gevumakapujonuzajimo.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/buwixujap.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210903_7F33AC8BDAC592E8.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/dipokonajirom.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/2849148516.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c47b019a5---tifivi.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/29366597992.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d490bdf3be---pufuxakilodazusulugugiv.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/26207694845.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/sufam.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/fipopa.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210911202314.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/99571128540.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/majale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tvtap+apk+for+firestickPDF 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_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 10444 bytes
SHA-256: 285ddbc5511b39b9e658927abe682496a0278b18e42be1cc64b74b6d9b31a94a
font_01_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 17720 bytes
SHA-256: 41d68d868e0269f41ad09f855466b59d251c2c8d6da09395848531788eefbdb4
font_02_sfnt_off00012fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1