Malicious PDF — malware analysis report

Static analysis result for SHA-256 226522a908cd7823…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 23:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa2b0083a804fbea43e9826045f71707 SHA-1: 427f926c6ab63c2c6adfec2d2f36299244c7b6e1 SHA-256: 226522a908cd7823d8f9c44c52d1c0311bc140bed73f38008007bbbde986e1be
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=online+movie+streaming+with+friends PDF link annotation
    • http://mgrima.com/files/file/13297119950.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/xewivekisegiroto.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/49327835992.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/digujigiwatexebusaxud.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/sonunegerogogagofobof.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/modojiramonizugejekoxa.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/fevetoj.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/97860673493.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/23459895954.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/tujurogibazudu.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/tavopebirukobamu.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/56975646942.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/xenumexexefivewomanujoz.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/semirenilesode.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/bebeni.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/ripenutitarabogufowadu.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/42101486514.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/36871098625.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/merew.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/fasam.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/93517702768.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/26786850615.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_off0000bff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 10976 bytes
SHA-256: cc9004b6b7b218dd28545590af81691e03c92e1055cb6ba59632513a7b054899
font_02_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 17288 bytes
SHA-256: 7d22e8a78023c6dc849c4f69d5211530ee3d42e2f8dd843ee72fb5ae0a13ea1d

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