Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd57f25e2116691a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 09:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43c34f18d6ca8771c530d79b1a17aa44 SHA-1: 717c939ed20a6ab14363541acaf238b5cffdb70f SHA-256: dd57f25e2116691a2c10dc39f4519b8cd799e7bf271c1fa439f8bffd73b43cc8
150 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to download and execute a second-stage payload. Heuristics for urgency lures and download buttons, combined with the ML classifier and ClamAV detection, strongly suggest a malicious phishing document. The document's structure and embedded content point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=han+esports+apk+v13 PDF link annotation
    • http://mojahotels.com/ckfinder/userfiles/files/luwafubi.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/60566794032.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/garuvemirutosuj.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/degufisekunikakelev.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/424ae78ff94d784020a085a23f29e8f5/vadisijatededagori.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/zotuziwipitobu.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/fopude.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161370f3562a1e---talawaguvavizataw.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/worunoxefef.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/73262695606.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/tozikifofuvisadupif.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/sozuzuminuresurapifar.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/zorusugexepinenusizotoke.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vidimobupijexebu.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/98147553039.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/lexanusone.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/pazejasarujaguzus.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/52557855679.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/90351860456.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/69669538794.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/71446162152.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9087720a4712f8bb3641a6d1f91a76c3/63100361709.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ziletunofafip.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/magutapetutexo.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/gofowanufimu.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/42255257900.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/13129107568.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_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 17404 bytes
SHA-256: 483f3692dcf136011b8015e231f299195aac556b007d1a57ead18a884fa28c14
font_01_sfnt_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 10480 bytes
SHA-256: ce2a8523f9d46a4fd0cc4447af03bfcb0469408ef74a1db77978e7428262e19e
font_02_sfnt_off000125a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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