Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b17bb6bd72d2860…

MALICIOUS

PDF

69.8 KB Created: 2021-04-25 04:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a9c6f41c88f2ff6c8fbcd73fcc7f1689 SHA-1: 782f591b954b2997e7e435a712ecf150102683aa SHA-256: 3b17bb6bd72d28600a96763f51fdfa4aa78f1e201eb35724db0abe6e91f0df2c
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=how+to+put+staples+in+a+stanley+staple+gun PDF link annotation
    • http://ratixopawem.mypressonline.com/cancer_espinocelular.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/genetically_modified_crops_examples.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/why_isnt_my_ps4_charger_working.pdfIn PDF document text
    • http://dinejokudino.22web.org/dear_man_dbt_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_2a032673371a49b9b90a3ee14abcc425.pdf?index=trueIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_66cd7f2bb31d4c29bd624d1516e5ad08.pdf?index=trueIn PDF document text
    • https://a513df27-8ea1-49e5-9b48-af726a3c99b5.filesusr.com/ugd/c567c1_06619d0b584e422084301169df0011c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f4782f-77b5-4695-9db6-fde5c9b93383/how_to_make_video_files_smaller_mac.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_a8a5e8f3b3d7438f8cbea81f82ab3da6.pdf?index=trueIn PDF document text
    • http://jepinoxuj.epizy.com/alto_s_lament_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5334734-cd7a-49d5-b938-929b82c8f1d5/91827637090.pdfIn PDF document text
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_ef6917e48099442991c20c1ea1510178.pdf?index=trueIn PDF document text
    • http://watusatuvor.myartsonline.com/what_is_social_research_and_its_characteristics.pdfIn PDF document text
    • http://rijonitapadon.myartsonline.com/ageless_body_timeless_mind_full_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a02e8255-1955-4167-8d4a-a3c2d75e441c/50050449100.pdfIn PDF document text
    • http://xumomevafuvozup.rf.gd/daisy_powerline_1200_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a68515-6698-42c4-9380-323ed40b2fce/juvoduxun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76a045eb-246d-4ed1-8cd0-d83a6fb3f68a/how_to_setup_logitech_wireless_gamepad_f710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b2b3a0-c613-4a90-bdfe-b49bd0ad4130/simplehuman_automatic_soap_dispenser_troubleshooting.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_aa4ca0ef2e0043119032efda4c88e7e0.pdf?index=trueIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_c9ede68ce5f743859f72b6748ef1dd1e.pdf?index=trueIn 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_off0000d285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 5044 bytes
SHA-256: 2c98bdfeffdc4a4444334ce41321ef72700750178ef7caeeddef92ef239e9d97
font_01_sfnt_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 10588 bytes
SHA-256: 5f6de4d8cf3de55e7a6d367deaea268556465ddc6658b2c75eeef6ffae94d9d2