Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b0c2298db61b1d…

MALICIOUS

PDF

75.5 KB Created: 2021-03-18 06:02:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 266798a5c082bd16376d79bd2deb7f2e SHA-1: d6708a858dd141cc4b6cf4e350fa70aa0039d217 SHA-256: 40b0c2298db61b1d04c40464c53555d26d3315d1f1332e34bc7607e986657ba5
184 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 domains and redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external, potentially harmful, sites.

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/123?utm_term=cardo+packtalk+slim+duo+manual In PDF document text
    • http://justamorem.com/age_of_empires_2_the_forgotten_campaign_walkthroughi55xb.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/math_word_problems_2nd_grade_online.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/cuantos_casos_de_covid_19_salieron_hoy_en_el_salvador.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_605283b06ab01.pdfIn PDF document text
    • http://watercart.ru/used_troy_bilt_horse_tiller_partscctjf.pdfIn PDF document text
    • http://purubifo.medianewsonline.com/beowulf_short_story_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_602d51d01b92a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456982/normal_6042be1f04003.pdfIn PDF document text
    • http://kumajamefe.getenjoyment.net/mind_body_therapy_methods_of_biodynamic_healing_in_hypnosis.pdfIn PDF document text
    • http://nextauto02.ru/pejezixotejunob74fbx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb75bcad-129a-4a25-bd2a-10db4b73eea8/4468085669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3239f8-f3ef-4753-ae33-8e751bf98ab2/1725498937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7448d06f-79f4-4a24-b681-c8fae22390df/science_a_closer_look_grade_4_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdcbe4b-d40f-4123-ba44-04b8af748c8f/30373141673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e432ebed-34c4-4d6e-809a-88a2967a0864/29496295459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b913a4-3888-4ce2-a1c7-4ebecae1a54b/jinopora.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/36385113168.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/55230338223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1e6d4b-8fae-4bbe-88c1-51413732f3f9/is_50_shades_of_grey_on_apple_tv.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_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 5188 bytes
SHA-256: 7e5a0c39dd0a4f8d87d1b298a285b78ef15e997ca720d2bf3260d18bae9b0be7
font_01_sfnt_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 10944 bytes
SHA-256: 20669baa4a6ace9c880a4eed67dc1504850f907095665c1d37e0a13b9f15950f