Malicious PDF — malware analysis report

Static analysis result for SHA-256 0686c968fb9e280c…

MALICIOUS

PDF

90.6 KB Created: 2021-09-17 07:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e801006dfec367dddc700e369856853a SHA-1: f05da758648ac6bd62da0b4598e8d6c5b723aad7 SHA-256: 0686c968fb9e280cb8147850529d2040fa2b57408c723e24180146273ebac310
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious PDF detected by ClamAV and an ML classifier, containing embedded JavaScript. The JavaScript likely facilitates the download and execution of a second-stage payload, as indicated by the PDF_JS heuristic and the presence of numerous external URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a phishing or malware distribution scheme leveraging disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • 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://coretry.ru/uplcv?utm_term=united+states+department+of+health+and+human+services PDF link annotation
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/84530207889.pdfIn PDF document text
    • https://arendic.cl/files/nijigekozeliloterireseki.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/tobibolikobawo.pdfIn PDF document text
    • http://chongros.com/userData/board/file/niwixojagowoj.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/90366135474.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/50255059777.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8631f7d1b3984f98a78204791fe97a32/vemedofonerewazifu.pdfIn PDF document text
    • http://irths.com/upload_files/files/90910203571.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/31291672540.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/24686072167.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/fuwutanurabi.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/16214540829.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411c32b6fb0---20007660033.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/zasifezojomazivewugaz.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/71216201071.pdfIn PDF document text
    • http://erdbau-rauch.at/nedotagozumoxuboxa.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/basarupasosewunufekopuxew.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/nusobotafixumadipiv.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/70828822819.pdfIn PDF document text
    • http://kftchem.com/upload/files/87874545308.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/73439226225.pdfIn PDF document text
    • https://zagi.hr/files/44077711593.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/95308421684.pdfIn PDF document text
    • http://air-con.ru/upload/files/3632063047.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/42289066820.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_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 11060 bytes
SHA-256: c6e6a45e4c6b64b0fe941a6c18e7c92b025b2884ede11051e0bb8a4a7885f8df
font_01_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C10 18644 bytes
SHA-256: 432855d3d66837a79c6bbc917eb3559598337e01cec7c5428121a9b768cbf83b

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