Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc349a5f8769617…

MALICIOUS

PDF

71.9 KB Created: 2021-09-23 00:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d776b2c791fe3b0a48e6d0fca228012e SHA-1: 56d50ae94ca599bfe64171d045a6c971f64961d1 SHA-256: ffc349a5f876961735b1d500388a60c5b486af4622bbfe8f38b0098a1d3b94b0
234 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URLs, indicating it is designed to interact with external resources. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's purpose is to trick users into providing recovery secrets or private keys. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://synerhu.ru/uplcv?utm_term=decrypt+pdf+file PDF link annotation
    • http://tractortools.cz/ckfinder/userfiles/files/darirunujikabalawakoseno.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/18255221434.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/17584063295.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/23508216481.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/jojosurelidesegu.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/mesixaz.pdfIn PDF document text
    • http://qdcmd.com/data/files/jedoxikevovogimonumifu.pdfIn PDF document text
    • http://standdominica.org/files/files/24230885313.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/60027862976.pdfIn macro / runtime command snippet
    • http://na3.it/misc/file/biburogediwewolexevofi.pdfIn macro / runtime command snippet
    • http://inciboya.com/resimler/site/files/nelunabegaki.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210923_052318.pdfIn PDF document text
    • https://aashianarealty.com/file/natobozuwixe.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/86738951993.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/45021946306.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/zexajuzopaluzexelul.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/1389253810.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/modave.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/votobiwuziwudorovemotar.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/e2ce480177325c9d85c363756deb7559/soxidanop.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/63915183590.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fekineniluzulifasates.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/fawagoxegapivofuj.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/13591437899.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/levugigis.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/23913435689.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130c82792af7---takutiropowido.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_off0000b9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CF 15964 bytes
SHA-256: 40a5c516c20ee52ac3456b2739bd2a0b3b5259f140fc57e544f3436305c1c7df
font_01_sfnt_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 10172 bytes
SHA-256: 780d339536b3124c98325ba16471f60d256a6d281d798969c8b776574a69b757
font_02_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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