Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a44425c6862446e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-10 18:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 957a9a8f9354b1d20d5a805def5a8d3c SHA-1: df51840db1799d3afac5bfc5d4d2deaec24cbcf1 SHA-256: 9a44425c6862446e230aa74cdbcc3e906940fa292082a1ea0bbef3319a624c2f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically linking to a 'flash player app for android' which is a common lure for malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute code or redirect the user to a malicious site.

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 https://crewmak.ru/uplcv?utm_term=flash+player+app+for+android PDF link annotation
    • http://captainkillmite.com/uploads/files/202109021537415737.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/tcvu0e3r8u9al7fvqbrhj8sba3/vatarozigov.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/59299352979.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/kuvenimewiruxivojibugiw.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/xirin.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/weniburefibuwowe.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/mumivuxiv.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/30700805912.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/60232480608.pdfIn PDF document text
    • http://sushibelovo.ru/files/bepafedux.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/xafatubowowenututesizuva.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/20400545650.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/60679985306.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/dedusafofawukefugevutipej.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/5697585854.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/8176044169.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613138f0156a8---dizuzesudibasulij.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/patikerov.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/59783406676.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/52217890267.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/rapivowiv.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/93666368586.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/5478161148.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/wetazaja.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_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 17332 bytes
SHA-256: 4d896ab780373a3131617f10398e41565c55c98632d4631524ad0353bd1017f9
font_02_sfnt_off0001326e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326E 10588 bytes
SHA-256: 01542cdad644e29065802cfe89f5bd4ccb31c868503369a1d7d1285638748aa5