Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc871a8e7d8051e0…

MALICIOUS

PDF

79.4 KB Created: 2021-10-16 00:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e89dd15f9fbf13ba6b3c616e996b034 SHA-1: e89b6f5f4fc484f46b7c9167451ff3cc0150ed3f SHA-256: bc871a8e7d8051e09331ee8eca5b26ab6d471b9567e754bd116efcf2329b51e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a high density of external URIs. The PDF appears to function as a link farm, directing users to various domains, one of which is specifically noted as a potential phishing lure. The presence of embedded JavaScript suggests an attempt to execute malicious code or further redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://irlanc.ru/uplcv?utm_term=jobless+claims+by+month PDF link annotation
    • https://avukatwebsitesi.cicasoft.com/upload/files/29539111378.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/76730918641.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/44231481898.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/tabepofupodutubi.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/polipebibebatogozovonikod.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/57826326704.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202110052149461748.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/wiluzirakaxiravum.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/zalirejezugo.pdfIn PDF document text
    • http://one9five.com/userfiles/files/fixibivibuwafukev.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/76897154359.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/mivinoz.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143af31a663c---82977561184.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/61725990892.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109300818477114.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/vimas.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/68695497847.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/ziwufoneg.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/99959361378.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/64247836914.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/33049184997.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_off0000d2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 10640 bytes
SHA-256: 395364c176f2a8104826e1d377ef607b9bfca5bf0217ef74784484a9995bb104
font_02_sfnt_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 17528 bytes
SHA-256: 3c6e9561796516851b3fe692497ce911dc83e0afbd88a66ce4d48b5a768e9ce1

Open this report in the interactive analyzer, or submit your own file for analysis.