Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ed3a4223b5f20f…

MALICIOUS

PDF

78.3 KB Created: 2021-03-10 10:18:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8c44070cf50c1dd3ca0fee9570ed68ab SHA-1: bb05a8cb1466ba429795ea0b512ee1ea8e6396a8 SHA-256: c1ed3a4223b5f20fa869d7e63a7820b4326d5910987a7014a5716a3568bb3f7d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/aws?utm_term=how+many+fortnights+in+12+months PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454990/normal_5ffb7b2193989.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/convert_big_file_to_word_online_free.pdfIn PDF document text
    • http://nosixavol.sportsontheweb.net/yoga_asana_book_in_hindi_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_6037aae556638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492871/normal_5fd33d26a376d.pdfIn PDF document text
    • http://kobodesuwid.getenjoyment.net/texas_instruments_ti-84_plus_online_use.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404116/normal_5fe023757a545.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466135/normal_5fc6bc1be64f8.pdfIn PDF document text
    • http://zomesotemaxage.66ghz.com/x_ray_circuit_project.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_603159258c27c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_5fd99bfaa8148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473041/normal_603f61d049091.pdfIn PDF document text
    • http://siwuxedoxip.22web.org/6266860276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xukokumo.myartsonline.com/what_did_mrs_zling_say_when_mr_zling_said_he_was_going_mountain_climbing_in_the_himalayas.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/tukebokiguze.pdfIn PDF document text
    • http://xixakoju.rf.gd/cashew_nut_health_benefits.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/airport_manager_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/anglian_water_report_a_leak_phone_number.pdfIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_895c021395bb4a26b86a32979de8c3a5.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_1b68283434e64130b169f82f621677d0.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_46e3aef10f934b2b81515cbdd142c4ce.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_f23332c2b36b4432a5a8e16956485c0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/5745412148.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_f9e8f980fb0c4ecc967742ca3232d490.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_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 5488 bytes
SHA-256: 679ed177604cba1753b96012210fef201921ca15e99e0f4c8cb10af05fe1d281
font_01_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 11524 bytes
SHA-256: 742e550ec61e33368116e3995f5dd80225388e97713072a574d6e9a467cee9de