Malicious PDF — malware analysis report

Static analysis result for SHA-256 3213b3ef92fe89f1…

MALICIOUS

PDF

80.3 KB Created: 2021-03-13 21:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3efc2e00df48eb432c93fe4518b3838e SHA-1: b87abb76d9b0fd1d53330a545bf46e0cb329f6fb SHA-256: 3213b3ef92fe89f136e69a210e40dcef4923a5b0f22d064482fb2b8f0901e8fe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and one specifically identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of many external links suggests an attempt to redirect the user to malicious content.

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://jottigo.ru/wix?keyword=dance+marathon+west+branch+2020 PDF link annotation
    • http://viwesisikumebi.getenjoyment.net/istoria_comunismului_romanesc.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/wemo_maker_alexa.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/define_competence_in_developmental_biology.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/xibuvobumagozag.pdfIn PDF document text
    • http://vvinorama.fun/railroad_crossing_signal_lightsx2mny.pdfIn PDF document text
    • http://legendnat.space/32288594932zg4n.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/refetozozonepinax.pdfIn PDF document text
    • http://latuha.com/what_is_a_theoretical_framework_in_nursingkjzyp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tikofaketonub/aether_2_mod_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/2019_answer_key_scholarship.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/how_to_rate_proficiency.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/rifimozol.pdfIn PDF document text
    • http://peledopa.myartsonline.com/42366058388.pdfIn PDF document text
    • http://visunes.myartsonline.com/we_gonna_party_like_its_your_birthday_song.pdfIn PDF document text
    • http://wowesuwufurofak.rf.gd/what_app_do_i_use_for_a_smart_bracelet.pdfIn PDF document text
    • http://xirozaza.onlinewebshop.net/anlise_de_contedo_bardin_livro_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/gangster_town_game_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/lufuporuzev.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 5252 bytes
SHA-256: b6abbfc4ef8d806e9d121971c8613b479a2f24bd92eeb9e7e1c3b8149fbb0692
font_01_sfnt_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 11536 bytes
SHA-256: b86bf4426282e203fc98abdb771d3bdefcf592f65b177b284174031d386c30b0
font_02_sfnt_off000125e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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