Malicious PDF — malware analysis report

Static analysis result for SHA-256 c249e9697631437b…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 12:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00f935515d28f3ffd964954cf9a5a79e SHA-1: 4c50a8eddef054dcb85d426d15273872c78e6b88 SHA-256: c249e9697631437b1aa7596697df200e42e85db1681f1fe4c5c5ca942c25ef89
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. The heuristic firings and numerous external URLs suggest the primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=efrain+alvarez+galaxy PDF link annotation
    • http://fge-service.com/userfiles/file/zadelin.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/82753155566.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/ripuno.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/31909192465.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/50593754336.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/gegexajomugoti.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/20860373329.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/f03tgsfqo6btchtskorco05pkn/juloke.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/8752545589.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/26581925097.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/girepepepipijep.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/66045679914.pdfIn PDF document text
    • http://state-lithium.com/upload/files/64308510712.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/mizugixexawepeniratasujom.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/demidawize.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/77379462968.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b38104f63---modobifevaripoduviko.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/40871208856.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/sexan.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/kivimiwedugodewudirepunat.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/gogapofaxumeganowivevudi.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/56919596159.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/27031765324.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_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 20712 bytes
SHA-256: d541cc788e11164934976114af25cad70b9f5a8322bf4c5af5613108223e8686
font_02_sfnt_off000130e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E7 10328 bytes
SHA-256: 1982e4fe2f08066d70b8887a60014c691b2edac3952ae3f1f7b2a287bec62277

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