Malicious PDF — malware analysis report

Static analysis result for SHA-256 149f51ddbff5f589…

MALICIOUS

PDF

76.2 KB Created: 2021-02-23 15:24:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d365291289d24cd8f970306559134080 SHA-1: 9875b6f02ebbf61a4c12c26ab76b4b27e5f28b5e SHA-256: 149f51ddbff5f5890a60447c4d0114ca18e8e614503adf3cddd7151883fe40c9
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one specifically appearing as a search result for a health-related query, suggesting a lure to a malicious site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent by identifying a link farm on disposable hosting.

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/strik?utm_term=is+3000+calories+a+day+good+for+bulking PDF link annotation
    • http://capridigi.com/fabobinotebulajebazasomrn01n.pdfIn PDF document text
    • http://fastcreditcheck.info/fani_cyclone_imagesdamr0.pdfIn PDF document text
    • http://robertferrell.net/interrogative_adverbs_worksheet3ib4m.pdfIn PDF document text
    • http://gavepokuni.22web.org/vector_canape_demo.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/icicYDa/hyperion_launcher_pro_apk_mod.pdfIn PDF document text
    • http://bbcua.site/975835453115hxqb.pdfIn PDF document text
    • http://summerita.fun/83385758884iriww.pdfIn PDF document text
    • http://doctora.club/raposarujowuzoderoighlq.pdfIn PDF document text
    • http://xogezile.66ghz.com/xatenijoxedalabujadego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fefefekarut.epizy.com/ecology_interactions_within_the_environment_worksheet.pdfIn PDF document text
    • http://duguferebijojo.rf.gd/discussion_lab_report_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/84661974737.pdfIn PDF document text
    • http://sokexodine.rf.gd/31291041661.pdfIn PDF document text
    • http://bapexuzajo.epizy.com/jasperreports_maven_plugin_compile_reports.pdfIn PDF document text
    • http://topufopotu.epizy.com/cold_pursuit_review_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/occupational_health_and_safety_policy_template_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/71841152174.pdfIn PDF document text
    • http://rusogiwelak.rf.gd/cisco_packet_tracer_official.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/bella_y_bestia.pdfIn PDF document text
    • http://ponuruv.rf.gd/st_bede_s_ormskirk_school_uniform.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_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 5736 bytes
SHA-256: c5b746f94f1b25ff8f3ea4cc3fc569b1156a822cff4dd9cf62a77d610dc2def0
font_01_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 10416 bytes
SHA-256: 53c507441b2e38f10f59d2bbe131aaa5ee47c330ba4bb132138e3d9acc088894

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