Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9bbc1f6ad02410…

MALICIOUS

PDF

73.6 KB Created: 2021-02-27 07:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7687dbbf6ce2e515299506ee4b14b9a0 SHA-1: a1b39b3bfa3f7085cfb93acddf14f4a103d3411f SHA-256: cb9bbc1f6ad02410098815b2a53e1d9ffaa4d29440c839bec614cb647d0c4e81
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the presence of embedded URLs suggests an attempt to redirect users to potentially malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/wix?keyword=delta+bench+grinder+tool+rest PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420906/normal_5fd96e70c7923.pdfIn PDF document text
    • http://sonifakeki.22web.org/healthcare_associated_pneumonia_treatment_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/ghqicYY/vitosumivuduzafoderavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5fd97c607a474.pdfIn PDF document text
    • http://tawokurabugo.22web.org/irobot_960_costco_price.pdfIn PDF document text
    • http://wigisosidika.22web.org/excel_vba_function_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_6013bc99091bf.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/hj1OUXC/danogolifaripod.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/bZI962Z/80569108094.pdfIn PDF document text
    • http://kasewokagirit.iblogger.org/madame_butterfly_giacomo_puccini_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rifukaleriduji.rf.gd/45134878252.pdfIn PDF document text
    • http://gorevifero.epizy.com/meraxadux.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/57498325025.pdfIn PDF document text
    • http://sexepafo.epizy.com/basic_instinct_2_2006_full_movie.pdfIn PDF document text
    • http://wubojupegija.rf.gd/tusavomudobut.pdfIn PDF document text
    • http://kixomeremit.epizy.com/noun_phrases_and_clauses_worksheets.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 5340 bytes
SHA-256: c12628f6a51c944da941a833db5038a620627572317a1255df226a17668dd303
font_01_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 10608 bytes
SHA-256: b8384cad000bcd9d50e2dba1788914b42931f4684c245fbc3671e5228d7ead8b

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