Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e56e138847d7db7…

MALICIOUS

PDF

155.8 KB Created: 2021-02-23 22:36:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1f2e5491ab0c2b75e7d55b433bc35d21 SHA-1: 5613ef58ff14e090e4d3fbc1f45845416835674a SHA-256: 7e56e138847d7db73aa9a8165e133c94e9a711a9332adfbf52e43291701a2c29
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=tutorialspoint+mysql+pdf PDF link annotation
    • https://rusipowesurajuk.weebly.com/uploads/1/3/4/5/134520473/ruzegorak.pdfIn PDF document text
    • http://veloxezidirexob.iblogger.org/cairoscene_ramadan_guide.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/xikesiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_602c995fce0e6.pdfIn PDF document text
    • http://nisisigewu.iblogger.org/19197257384.pdfIn PDF document text
    • http://zojalokavid.22web.org/43629805033.pdfIn PDF document text
    • http://tonorubur.22web.org/film_balls_of_fury_full_movie.pdfIn PDF document text
    • http://judijemavup.22web.org/first_aid_merit_badge_workbook_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botasalipigu.epizy.com/nec_advanced_analytics_platform_solution_templates.pdfIn PDF document text
    • http://lipewolitaden.epizy.com/23841850927.pdfIn PDF document text
    • http://nononowixumutu.rf.gd/mosijamelejopefofubiwu.pdfIn PDF document text
    • http://kevusej.epizy.com/atal_pension_yojana_tamil.pdfIn PDF document text
    • http://vukenorap.epizy.com/sewage_treatment_plant_commissioning_report.pdfIn PDF document text
    • http://mifamin.epizy.com/wituzawujulogofopunejo.pdfIn PDF document text
    • http://pemukusa.epizy.com/31170369791.pdfIn PDF document text
    • http://fepaxediv.rf.gd/60936705844.pdfIn PDF document text
    • http://kobaporosonunaw.rf.gd/xufejosolefavopeku.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_off00022439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22439 5364 bytes
SHA-256: 1217d646bdc8257a6d489761eee9595d158174d41f93037f7f0745acea37e4c4
font_01_sfnt_off00023664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23664 13044 bytes
SHA-256: 734a3f6fa66983e136dc029868085ded5469c4a5a7a2044c6ae500f507d02b2c

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