Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7c765574ae0e31…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 11:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 37018930ab0472ab2191ffa320bbc246 SHA-1: 71d3e4dec30aa559b2da545928bf74fa33028391 SHA-256: 9a7c765574ae0e31be92a186bed0825a0fcee2c82c4687ff271a1dbbfc4b6349
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also references numerous external URLs, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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://medvor.ru/uplcv?utm_term=life+after+the+navigator+watch+online PDF link annotation
    • http://cutyoursupport.com/userfiles/file/zubakinafuweve.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/kimefufidebirenariketi.pdfIn PDF document text
    • https://sd-olimp.hr/files/80021341896.pdfIn PDF document text
    • https://btegypt.com/file/widaradomupisujikunipivu.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/rofobewifazemobim.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/93165341451.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/vevafufuludes.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/29906329450.pdfIn PDF document text
    • https://gtsk.solar-napkollektor.hu/js/ckfinder/userfiles/files/43550901975.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/kazelusedazajibel.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/bateranurerotipoduz.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/40225786958.pdfIn PDF document text
    • http://fittbikese.hu/files/file/27235709412.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/45616012516.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/meroviborafetexekulan.pdfIn PDF document text
    • https://gilbertems.com/videos/file/tafozuvexolijajutunak.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8f5831dce---27462734152.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/ketuwisimumizidutenevejis.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/pexekubojezeza.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/38071963670.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xijipasafezodemebutigo.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/97151157479.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ee9807418e6ff1ede0ca40866cdc99e9/zosedewokuz.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_off0000b0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BE 10556 bytes
SHA-256: 6a326c3884ad48aca87f5afb2846ea7007cb1f9dc783befd48997e563135bdaf
font_01_sfnt_off0000c8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 15484 bytes
SHA-256: 88e5d508a1018e11cac270ba202a66809cd11112eb4be94ef220b9018b469f3c