Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7cdbb600d354aa…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 15:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b6c4d7296016ebb76d0f28afd2fa3bb SHA-1: c6878d30df9ba36efd9bd6b1cb7d8c6788ca662f SHA-256: 6b7cdbb600d354aa3aa2e7319acfb684eee24671c9702e646c392c75780b4aa1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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=bubble+shooter+wali+game PDF link annotation
    • https://latework.cz/soubory/3071793548.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210910104946.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/fekejokegipolisox.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/44342717720.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/rawasudelufalirunovuxena.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/manetoreles.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/jesaw.pdfIn PDF document text
    • http://slovoveri.org/userfiles/47146521751.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/rujirato.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210903102559.pdfIn PDF document text
    • http://newcityhk.com/userfiles/kenotatizagiveg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb56e097b9---82534060874.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/32456505967.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/suximoborijifopiwunufelaw.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/mabixokodorawazoxenopuf.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/6499119184.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nexasanaduzitonerixeke.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/43495842194.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/35122790664.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/21187059632.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/58779423195.pdfIn PDF document text
    • https://dhesient.com/media/zimetupo.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/rofeji.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_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 17672 bytes
SHA-256: 883b429cca362db001ef0e8f92c81dd26860ef74a3f378c19d2b69fdb0a3a3ed
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 10828 bytes
SHA-256: e5a271ae0bbf6d20d86218ccfe2b624c75af1e3277f5319f61d60e11345631f8
font_02_sfnt_off0001241f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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