Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef45ecfdc7cdd8e…

MALICIOUS

PDF

74.7 KB Created: 2021-04-27 02:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4ddad670f329bae1e09c55f9f8d67031 SHA-1: 22d67cb8bead12c81143b086bdf383a9e462b7ed SHA-256: eef45ecfdc7cdd8e1102d81de8cddd875820b9d8227dff31229aaccd886330ad
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=epic+software+training+for+nurses PDF link annotation
    • https://genoduvule.weebly.com/uploads/1/3/1/4/131407197/d882df705cf9.pdfIn PDF document text
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/lasegaruf.pdfIn PDF document text
    • http://copyrightshelpscenters.com/wuthering_heights_oxford_bookwormsi2tdh.pdfIn PDF document text
    • http://wgathering.org/fishing_rod_clipart_png2rf7a.pdfIn PDF document text
    • https://mekiwukokoviv.weebly.com/uploads/1/3/4/8/134867966/1704626.pdfIn PDF document text
    • http://interstart.online/how_to_get_math_answersamil7.pdfIn PDF document text
    • https://zunimivivonuz.weebly.com/uploads/1/3/4/0/134017399/3439375.pdfIn PDF document text
    • https://narepugajud.weebly.com/uploads/1/3/0/7/130775299/a006ad7a71.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/cjcLdnV/bivazozukasunevadebe.pdfIn PDF document text
    • http://usejus.pro/4827866614o9734.pdfIn PDF document text
    • https://dumuwikodopod.weebly.com/uploads/1/3/4/4/134458554/9598170.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/PbhiLjh/hangman_words_list_for_seniors.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/lawakux/kurafuwedaderupemavom.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/what_does_the_acronym_abc_stand_for_in_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/butler_university_tuition_remission_form.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/bugitotejifofusufev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb69be1c-0f53-4e92-82be-bc7f3b791037/how_long_do_i_cook_steak_on_foreman_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a4a8cb-bac0-4324-85e3-fd1552afdb16/hunter_college_spring_2021_academic_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de0da45-c05a-4e6c-b421-9430aef3db5e/do_i_need_to_drain_my_haier_portable_air_conditioner.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_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 5200 bytes
SHA-256: e6aaf486ec096984466e60714cdb608b5f2381d6d437645e80e819f2a241a482
font_01_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 10284 bytes
SHA-256: 5d1e4865e4bd48dbfe2b9c31c9a409d4aa6fbaaa32c317673ca11c63a76f25e2

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