Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8bcdecbc1388b1…

MALICIOUS

PDF

72.7 KB Created: 2021-09-11 17:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb137a50823a707d982e8b086719ba05 SHA-1: 5863f57844b83fb895f0504b48938d924b04a4d7 SHA-256: fd8bcdecbc1388b14b7930453ad413574a5f4dcf932d7ff6c4986c6798fa846c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing JavaScript that triggers an external URI redirect. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, and numerous unknown URLs were extracted, suggesting a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://bahispesinde.com/gnc/veri/_files/18771256849.pdf In PDF document text
    • http://zae.me/datafiles/file/nimilokinuriv.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/92363952102.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/13626033705.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/46053667403.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/vujujus.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329fdf6be65---gijedesuvosevo.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202108311814089554.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/fapoguxanixe.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/winozeg.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/65771972937.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/17119322452.pdfIn PDF document text
    • http://htwy.com/upload/file/vujapinebobifube.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/libedasorutojukaje.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/75007404887.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/44225793463.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/jipimipobawumod.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zenuxunojuked.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210908_EFE92BECB24E83B2.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/boxiwipipuxobujut.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/basepuwabolew.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/vadebotunesajudinovojawi.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/bajivotovat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=jai+hanuman+gyan+gun+sagar+jai+kapis+lyricsPDF 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_off0000b4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F8 18408 bytes
SHA-256: 5c8ab91578582c886ab388f6de1095e2522d8ea593f78a3342e7754b9f3472b5
font_01_sfnt_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 10900 bytes
SHA-256: f54b0ca89888dd45f99013a409dd8f3633374e9c5e6a5bf9eea851e4c8387bb5