Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c94f90baefd4ca…

MALICIOUS

PDF

76.7 KB Created: 2021-06-09 00:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4d15cdcdb6f968465e976d1e53c54cd2 SHA-1: 51121eb0b21c61ebc4d80727aa076eead8f48c4d SHA-256: 88c94f90baefd4ca4e5240cee83e801416798d1ed3cb74fcf5c5f57783812cbf
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm and a specific URL related to a game hack, suggests a phishing or malware distribution attempt. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick users into downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/pbw?utm_term=hack+among+us+always+impostor+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492575/normal_5ffb30e4ca432.pdfIn PDF document text
    • https://sagoxanoku.weebly.com/uploads/1/3/4/3/134350044/9e53c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476767/normal_605b71444b75d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_606e0ba19b709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_600c65f560dda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_60168c9464501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_605fd5391f32c.pdfIn PDF document text
    • https://raxunumi.weebly.com/uploads/1/3/4/3/134350385/4801281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_6035e9cd3073f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_602d0f135f322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_6040ab842e4cf.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4485301/normal_60b35e29eb4f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481164/normal_5fc67d3992c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488817/normal_600c6dffa64fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465264/normal_5fe3ffda8f57d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_603037a5620ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bae6cb4-8642-4c9f-bb3d-bf5661f952a2/poemas_en_lengua_nahuatl_y_su_traduccion_en_espaol_cortas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc01bdc-1612-42ef-ba4a-915794f33b41/62684727274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64646f35-22e1-4db4-9057-417ca811a7e2/how_to_install_the_chicco_keyfit_30_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74813811-dab6-4e3d-8db3-24c82ef05c9e/chess_game_learning_app.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 5472 bytes
SHA-256: 85e603cbc4f415a042e8f066a63665a5258f450537e424787fbc17c94ea3b43c
font_01_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 11416 bytes
SHA-256: abc72e9274cb8570cab6b86f474aa353f4f042f78faa4a96fea5d07f1d457e74

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