Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e15fdc5059cf5d…

MALICIOUS

PDF

70.7 KB Created: 2021-05-31 20:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9805f3222eed231db895c8475543e7d8 SHA-1: 0d1fe31130de9a17c820364fbaec5be2b6d04d0a SHA-256: 83e15fdc5059cf5d29907a42b657c98e66f51bc829e58080fed9d32286102cfb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to 'wastran.ru', which is likely part of a link farm designed to redirect users. The presence of embedded URLs and the overall structure suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/pbw?utm_term=polaroid+song+imagine+dragons+lyrics PDF link annotation
    • 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/e90a6c75-83a1-4bfb-8d26-2675ca0bc270/5_day_keto_egg_fast_meal_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870d020d-5dba-4ad4-952e-59c3c3b48371/31218612075.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/20571642886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43038f12-6b99-4250-b0c0-60f1822b6736/72716821813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5106832-50e9-4ff1-96ff-95ef3184e2ef/20265552056.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144414729/types_of_register_in_english_language.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/w/file/fetch/144417993/ikea_catalogue_2021_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a153b84-2651-4ccf-9988-5160595e06c4/manual_de_direito_administrativo_matheus_carvalho_epub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44b4c09e-0b4e-4f3b-ac10-dd203ac7be65/butikiwuvetisaketi.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/wings_of_fire_rainwing_icewing_hybrid_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dddcf000-4670-4233-82d2-208129096f0e/que_son_las_purinas_en_la_sangre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef3909a-6ac3-412c-b181-3ac673b90cd0/masotejemegen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe4774f-72bb-48dd-9999-6937beeac70b/how_to_hard_reset_a_motorola.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/how_to_repair_a_swiffer_wet_jet.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/duralast_700_amp_portable_battery_jump_starter_manual.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/28667186608.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/what_is_an_example_of_combined_variation.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/f/2005_yamaha_fjr1300_service_manual.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144415641/what_is_vrv_air_conditioning_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e398a75b-e29b-4adb-a2df-b8d0f5d96903/nelson_handwriting_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a19d87-9b6e-4890-ae9d-a114fd66ed98/56579212164.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_off0000cb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1A 5072 bytes
SHA-256: 8595d596f4d6ec0d63c465e659129a9696a73f75bb1dde89ad0a520b1f24608b
font_01_sfnt_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 10220 bytes
SHA-256: 7d3ec83455b86fa827740ba981b5223e0f22ba8cf8546a1d9ed9729699ab489d
font_02_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3