Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da8416c93273f25…

MALICIOUS

PDF

67.6 KB Created: 2021-03-05 04:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a3a4f2f8355075de98ff75fa21761dba SHA-1: 3889575a5eae13b7ee5957e12cd32aa615c514a8 SHA-256: 9da8416c93273f25eb761b8923977bc499dc885d5c73be8e5dd886849df066af
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain keywords related to search terms, suggesting a phishing or scam lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=hunter+springs+park+in+crystal+river In PDF document text
    • http://dapabikokewe.iblogger.org/channel_10_ballarat_tv_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/igjgKjj/cross_stitch_linen_sizes.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/iethfje/99897232401.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/jjPSBgd/jitapuxarogexoz.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/ififhg4/charlie_chaplin_the_great_dictator_speech_remix.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/chcc6RS/rukotidomafadij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pudubekij.epizy.com/historia_de_la_fisica_antigua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be228729-3af1-4788-b383-54241f32e940/what_does_woe_mean_in_keto.pdfIn PDF document text
    • http://jajowisomipuw.epizy.com/how_do_i_stop_my_nespresso_from_blinking.pdfIn PDF document text
    • http://xekibedeba.rf.gd/funijasuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec68197-142b-45ac-8ffe-4481209a4b6a/stages_of_relapse_gorski.pdfIn PDF document text
    • http://tofunogamovolad.epizy.com/15579297772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4842d63f-93f9-4417-882d-82b5e5788d3e/35736959078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec7b6f8-7a17-4c26-b13f-84a34fac3e95/xuriduxelile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef878bf-58aa-43f6-873c-fcb0efb1aee9/duxaganowubeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d64a4a-f7bc-4801-a12c-d3077a036180/consider_the_infinite_geometric_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96174ed2-5b40-49fb-9541-e8b8761becb1/functional_training_exercises_for_beginners.pdfIn PDF document text
    • http://mogerokefo.epizy.com/bella_ciao_piano_sheet_free.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_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 5288 bytes
SHA-256: 3730aa1013c7f24083df107abadfb34896ce05e6d685ecee94035aa86cf98a40
font_01_sfnt_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 10212 bytes
SHA-256: d947666656260c8388bb1e567dabb785d5889ba87b15a6bf6d2bfa41631be352

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