Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90b225e33e00c44…

MALICIOUS

PDF

104.3 KB Created: 2021-09-16 20:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76fc8e1ff11c9d15f1ceec27fb4e8e20 SHA-1: 450a36a0a0977556d113f1e8ca6518426192808d SHA-256: c90b225e33e00c44738d66d0331d70b0054b31da5b52a19f87b0f08feefd4ab1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially harmful content or facilitate SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://buzmakov-ua.ru/admin/ckfinder/userfiles/files/36955341318.pdf In PDF document text
    • https://tecnicadovolante.com/images/file/daridoweveg.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/novumuberiniv.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613956edd33f3---92172807289.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/50240908847.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/ratavejanije.pdfIn PDF document text
    • http://ubest.ru/images/file/70305170456.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/jikero.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/22448593524.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/kovod.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/ralagiledetozif.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/bakulinuzerilogefinot.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d6d627b8---5383995754.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/kejuremazusare.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/nijoga.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/lavuxusilogu.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/jawamonipubiwofutoz.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/86308944946.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vamewaxizalusovuxunevobif.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/66320484711.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/jafimapipepawez.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/38039681786.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/fezogidigimunided.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/mapabakafe.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/99100695462.pdfIn PDF document text
    • http://calisnt.com/uploads/files/45498721991.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/82665580589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sim+theme+park+androidPDF 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_off000130ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CA 10608 bytes
SHA-256: e3f9ec5af8f1e7211b6559e300f6039aabee47d8cba73671ba710984c05200a4
font_01_sfnt_off000148d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E4 19280 bytes
SHA-256: c8f04a87ff713117bba31fb61314e51db40b23fc0515e4686569ea92f14647e2