Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb83ae6dbedd588…

MALICIOUS

PDF

75.2 KB Created: 2021-06-11 12:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3576b777daff1042e86bac9a3fe4fa2e SHA-1: 53f65dac7b9b10e7a147e1d56038519a307a9ac4 SHA-256: ceb83ae6dbedd588b5dfe80e05baf00ccc1e2d9f43f816a3f0ad33d0a161633f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL, 'https://chcial.ru/pbw?utm_term=as+rs+systems+pdf', identified as a potential phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable hosting, further supporting a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/pbw?utm_term=as+rs+systems+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448124/normal_60181ebb07164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_60277ff646085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_601556b6bda70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482849/normal_60c060583eb55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wevapejatu.pbworks.com/w/file/fetch/144786684/neural_network_projects_with_python_free_download.pdfIn PDF document text
    • http://sakulibur.pbworks.com/f/super_worldbox_free_play.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/ninja_foodi_grill_air_fryer_recipes_youtube.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/teaching_feeling_apk_android.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/go_math_grade_8_selected_answers.pdfIn PDF document text
    • http://mevuteled.pbworks.com/w/file/fetch/144553488/sanesuzajazuvisabawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc4d60c-05c1-4e8f-91e9-b3e10b03cdbe/what_size_carry_on_baggage_is_allowed_on_delta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f350754-8a80-4efa-84a0-385761b16e80/dezepijurixode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/263d3b21-47ca-4778-a95c-5f807e4acbb5/32955695023.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144418398/twrp_3.0_2_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff4a83c-a234-4293-bdce-003198808793/chicken_shack_near_me_that_deliver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab8a65d8-933d-47e3-8f05-c9c2303b2ecd/uppababy_vista_v2_double_2020_stroller.pdfIn PDF document text
    • http://fosirodovo.pbworks.com/w/file/fetch/144754938/51906901657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2770cfc-f46a-4d23-b0a5-98cd2be05052/what_foods_should_i_avoid_while_breastfeeding_a_baby_with_eczema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bfec20f-ccde-4a79-8e5a-239a066a6df5/what_to_put_on_resume_for_waitress_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291bca73-cb7a-4c9f-8d31-3033bce5e30a/how_long_does_it_take_to_fall_100_feet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e3bceee-af21-417f-ab2d-4402b1dac970/somikogedifapixaxatujat.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_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 5036 bytes
SHA-256: 7baa62fedd97e16a7be157a912accf46437b592adc3b8c13afcf2d68a1f1bfe4
font_01_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 10444 bytes
SHA-256: bcb2e985bfdd42ced212cea2a0ae90c49849baa782a98218a4c7ca947ae463df