Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d4c9784ff12eec…

MALICIOUS

PDF

92.3 KB Created: 2021-03-14 07:20:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: cdb6a46733cc7c1846f0cacdfd88b370 SHA-1: 47765b19cb369fcd0254d1fce01c65eaa9431a81 SHA-256: 88d4c9784ff12eec5a1905b2f1e426d5e9e8afc7ac4aa989944026b707cac7a0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The embedded URLs and the heuristic firings strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://midufefew.ru/123?utm_term=autocad+civil+3d+2019++free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5fcd6ac273958.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/technical_project_manager_salary_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/sufipuxifemo/geihgfp/27765086934.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/fhbgiBl/23078740761.pdfIn PDF document text
    • https://cdn.sqhk.co/pexudolifa/Hiaheia/govonixevopopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_603caf4ac16c3.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/how_many_pages_does_harry_potter_7_have.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/kelabo_bafuzetituge_mupelitabuz_virisovibazujuk.pdfIn PDF document text
    • https://zovoxokovu.weebly.com/uploads/1/3/5/9/135957880/degej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479236/normal_604d0ca3bb795.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/jensen_awm968_remote_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/jawosuzexe/hmNijjg/witunize.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/can_you_day_trade_stocks_on_robinhood.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/vWjjghX/cara_memasukan_voucher_game_online_mobile_legend.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_81e9ee33feba464a873eac2f2ff8ede8.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_407d40f8b0b346ef88bfd5190e185665.pdf?index=trueIn PDF document text
    • http://muzulozak.atwebpages.com/45843320705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62dd7856-2dda-4a3c-9fff-e7d90c124072/pl_sql_developer_jobs_for_3_years_experience_in_bangalore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a180cd38-9160-43d5-acf7-b0d2e1fd9ace/6690608805.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_3aa2b0d38787422fa36558d6ab159a6d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30bc12fa-f1ef-4a84-b0f5-b83c96aecea4/tawojatuwesomirujuteta.pdfIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_4b8badc24cc341c69c270be7df991dcc.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_off00012cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDD 5532 bytes
SHA-256: fa499817ca87c235260ff94f71e407b8bd06f7b335371061196421fbd3f1c436
font_01_sfnt_off00013fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCB 10664 bytes
SHA-256: b2633eabdd50523c2fb6c30ed7162476ae8e369fe35f1cf2deba110ffeec9c50