Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b75445798db133…

MALICIOUS

PDF

75.1 KB Created: 2021-02-24 21:04:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b31631e23931d129c22f8c53781ca5a8 SHA-1: 98dd042deb100c5e7a4f7c196b3ff09a5c03392d SHA-256: e4b75445798db1338889fa5e561ebe83e45d168dc0baea32d135afa3b60b7092
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links pointing to suspicious domains, identified as a malicious redirector and a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious. These findings suggest the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://yafferge.ru/123?utm_term=kenmore+vacuum+model+116+service+manual In PDF document text
    • http://lazujifoxupa.getenjoyment.net/survey_on_machine_learning_algorithms_for_liver_disease_diagnosis_and_prediction.pdfIn PDF document text
    • https://cdn.sqhk.co/povuguzuloga/javz2X0/drive_in_movie_theatre_near_me_open_today.pdfIn PDF document text
    • https://cdn.sqhk.co/rasufizo/VRtZ6jG/barcode_scanning_app_iphone_free.pdfIn PDF document text
    • http://bestita.space/vesapatufikowuxorezukodgjfo.pdfIn PDF document text
    • http://guwizerawefoke.iblogger.org/16626688623.pdfIn PDF document text
    • https://cdn.sqhk.co/jujifefa/bOhM0jq/52468668316.pdfIn PDF document text
    • http://blog-millionaire.buzz/fojezawegarofomanazuretjzlbc.pdfIn PDF document text
    • http://unlockdeals.shop/92856738626lopei.pdfIn PDF document text
    • http://latencfsrt.space/what_is_the_prophecy_in_percy_jackson_sea_of_monstersvo1gh.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/southwest_premier_travel_insurance.pdfIn PDF document text
    • http://profaudit32.ru/fukepa8qevl.pdfIn PDF document text
    • http://hookup154.space/17556374516v3cgg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/rite_aid_blood_pressure_monitor_wrist.pdfIn PDF document text
    • http://fonujepurixadal.epizy.com/how_to_teach_the_verb_to_be_to_esl_students.pdfIn PDF document text
    • http://dujawupiraxep.rf.gd/define_centralization.pdfIn PDF document text
    • http://firotiz.epizy.com/gas_sensor_arduino_datasheet.pdfIn PDF document text
    • http://kesekerezox.epizy.com/visual_voicemail_transcription_android.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_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 2888 bytes
SHA-256: c82bebd4b493aaaf84143f05ff6967641e6933e4069ecd51460b008fb5b9cf8a
font_01_sfnt_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 5320 bytes
SHA-256: 7f805b8eb266a2c082bb9d97552e607d482e8f699df761cdf8a9fca05c35ae30
font_02_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 12008 bytes
SHA-256: cfea345e7c138739335d5f4416589e14d203e472e7f64910de60816370a833e9

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