Malicious PDF — malware analysis report

Static analysis result for SHA-256 81530d2f0a5422fa…

MALICIOUS

PDF

78.8 KB Created: 2021-04-04 08:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 91987b7b981857d61f0e9dd19eb1aaa9 SHA-1: f74d5b63902f4218b34b55367b2f1a0f3a619333 SHA-256: 81530d2f0a5422faef862a3a71c50dc6f55afd1255e3ee48a2eb35151409b919
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://botokaw.ru/award?keyword=convert+pdf+file+to+word+for+editing+free PDF link annotation
    • http://joriwolujuf.sportsontheweb.net/national_bioethics_committee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445558/normal_6037bd523763d.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/bram_stokers_dracula_film_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_60630349b4137.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/65503518066.pdfIn PDF document text
    • http://kufejat.sportsontheweb.net/vawakafefike.pdfIn PDF document text
    • 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://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_b5f24bf1e1b9458f829847607885d284.pdf?index=trueIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_b6ab3d9d5f354ce3a12b8d27f2135f85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/wirukujeb.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_8416f548d8c0429caee522c12494b722.pdf?index=trueIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_cbf0d35a4baf43828f3c69d5a2a7818e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dofufiri/pdf_quant_job_interview_questions_and_answers.pdfIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_9bb2c7570abf4388b1eaf95ef075c26a.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_37e995ce730b41f69403660ab919ddf7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/the_game_tv_show_netflix_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/lasagna_recipe_with_fresh_pasta_sheets.pdfIn PDF document text
    • http://gajopule.myartsonline.com/20352917433.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/danielle_steel_jewels_movie_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/30937206551.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/calligraphy_fonts_a_to_z_capital_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/google_image_search_android_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/sql_server_management_studio_tutorial_udemy.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_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 4784 bytes
SHA-256: 6a1c93ce96cd22f72e1d925c48ce1ade31ba883d93686b6edb51c4248fa95ab4
font_01_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 10216 bytes
SHA-256: f7edca5430a1a382db0b4ca81f4019021b03d3d28dae1bca7d36804f4b6716c5
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

Open this report in the interactive analyzer, or submit your own file for analysis.