Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a066ea1770b11e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-22 09:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21a48b1c3939ec53f68d9e366c88251c SHA-1: a25cd34c07dcf7b37f4cd17246c9711b67a46fbe SHA-256: 73a066ea1770b11ec5d0fc4f462a69cb0f97bdac1b9d16975fc02bbc8d35109a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous external links and a heuristic for a 'download button' lure, suggesting it's designed to trick users into downloading further malicious content. The presence of embedded URLs and the link farm heuristic further support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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://ketchas.ru/uplcv?utm_term=tom+and+jerry+trap+o+matic+download+for+android PDF link annotation
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/kijowamopufudunukedu.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/leten.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/53349317012.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/runemafemezugan.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/6926844794.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/50219937143.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/topitubefefis.pdfIn PDF document text
    • https://birotex.rs/images/files/43818688135.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/281488884.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/vufevam.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/2580086972.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462dde69256---gugexurenagopurug.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210907063735.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/zemagelupisoruresojajeta.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/75030360683.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tekobovonokejov.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/razojowij.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/lufojunumugajakovu.pdfIn PDF document text
    • http://saaretravel.ee/images/file/soketepiwi.pdfIn PDF document text
    • https://quizai.com/uploads/files/74666296291.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/bipimurukavudawewinivin.pdfIn PDF document text
    • https://togeltop.net/contents/files/wikupagolemukabozubufifi.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_off0000ddad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 10904 bytes
SHA-256: b348727a0d9c2dac785386aa9c8614856d7c356c30d9d340deed1d2b1ed58733
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 17672 bytes
SHA-256: b7a1f18522e23f1eaace052e4bc50e7578e06b90c391593890afa332a4f9a3f6
font_02_sfnt_off00012509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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