Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db3bca70044d603…

MALICIOUS

PDF

77.6 KB Created: 2021-05-21 23:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 186356eb70f3e9d4c95952c0730ee8ef SHA-1: 9270f457ae8d99030e6dc7f4e4c13927a94b1bf0 SHA-256: 5db3bca70044d6035db26792b3de354048b0656ff7113d61948957233ef19d91
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://gimoguvi.ru/strik?utm_term=diccionario+jur%25C3%25ADdico+mexicano+pdf+2020, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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 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.
  • 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://gimoguvi.ru/strik?utm_term=diccionario+jur%25C3%25ADdico+mexicano+pdf+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370268/normal_602ac8cfea60f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_6065dec4d2f4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5fedb36166c3d.pdfIn PDF document text
    • https://wiludexubusut.weebly.com/uploads/1/3/2/7/132740186/3650e0fda3eb17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_6035365463ea4.pdfIn PDF document text
    • https://kafiwixuvaso.weebly.com/uploads/1/3/0/8/130874495/751939.pdfIn PDF document text
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/4ab093c7071775d.pdfIn PDF document text
    • https://wivixovipi.weebly.com/uploads/1/3/4/4/134442696/4b9688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446500/normal_6041a901b1d0f.pdfIn PDF document text
    • https://rapekazojeroxe.weebly.com/uploads/1/3/4/6/134697974/8ab14ffb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3226f917-81b3-4a65-a2f4-403177bfa854/12160261779.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/will_doctor_sleep_have_a_sequel.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/compliance_plan_audit_report.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/breast_biopsy_report_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c67cffcd-b83a-4197-84c5-fdbae2aadec3/3rd_shift_jobs_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552558d8-0744-4ab6-aa3c-db74757d690a/nulosijosakomixera.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/77319557409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd4d2c20-3a5d-4a74-a089-bd246c41c6fe/phrasal_verbs_dictionary_oxford.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12d3fdfa-1450-421b-ab3c-4304615e9daa/how_to_cook_burgers_on_cuisinart_griddler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcbbcc98-48da-463d-9fee-5900fd1cd70d/wd_my_passport_ultra_1tb_external_hard_disk_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/557fd8b6-3d6d-4e3a-ac3f-a55af2b3c519/kemilutefikavewobemesa.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/cafeteria_plan_advisors_form.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/ngu_idle_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad1e44b-e11b-4806-bea3-aa4f8970f6f9/39043654887.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/python_anaconda_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/660385b7-fda8-4056-8456-f84b8cbd71e8/how_to_use_a_wagner_250_paint_sprayer.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_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 5364 bytes
SHA-256: 6d5f31caec2034c4bfe4bd7b8b20e538efe17515c1c90f64c0d4b72bd8d41ac7
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 11260 bytes
SHA-256: eb9b7bb46ab5da8b122a7f8c93e19854937ff88cef7e80c640e757ec32ccd7e4
font_02_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333