Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9045caaa89ee84b…

MALICIOUS

PDF

70.8 KB Created: 2021-09-19 21:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19ae29d5a9030e121663747b4c908f06 SHA-1: 043c6d624eaa1f27ba38e4302caece7df7dd568f SHA-256: c9045caaa89ee84be6de69ec5d7ec1ffa50b2c3870ee2940159f3a4584db0d33
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam pattern, where the document prompts the user to call a phone number. While no specific scripts were extracted, the PDF structure and numerous embedded URLs point towards a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://arrayamed.com/userfiles/file/miwajutotaja.pdf In PDF document text
    • https://gancza-yacht.pl/userfiles/file/67659431442.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/pemomadepelerujovebutobub.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/lufarelima.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/52571291149.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/menuwemumifamusatovetev.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/80769753409.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210907150040.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/piwilukekofevenarotituk.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/zatas.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaeeab2ae4---refafeberakibelapevi.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/56773618903.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/75816572630.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///32262054392.pdfIn PDF document text
    • http://ridendo.cz/files/file/jasuzuninedalasibi.pdfIn PDF document text
    • http://novafish.it/userfiles/files/daxapilowof.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/61663082801.pdfIn PDF document text
    • http://platcometals.com/images/file/91974186495.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/rugoxuwewezurani.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/55964161651.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/teboruzudoze.pdfIn PDF document text
    • http://kes.org/upload/editor/files/44364420291.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/dopofirivonotam.pdfIn PDF document text
    • https://alutat.com/data/file/wepup.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/91149588916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=psp+ios+gamesPDF 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_off0000b65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65B 10248 bytes
SHA-256: 69a7d1f7af8ab9b1cfa5ffa38ac9c0340e4fdd915a509875c09bd241842583f6
font_01_sfnt_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 15844 bytes
SHA-256: b3d1057eddad66a97d1085ff47011efc0dfcaeed48dda601a1119db3348705e6
font_02_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1