Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd893c7e8f5b9ca8…

MALICIOUS

PDF

77.3 KB Created: 2021-03-02 11:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f9affb673c19886ac9bb50d6882074a9 SHA-1: 042089e23edbfd01196eea709e8c806eb274e372 SHA-256: fd893c7e8f5b9ca85bc5bd22be78365ba228241055328c463b60afff0846ce66
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or phishing content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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/wix?keyword=mobile+hotspot+pro+free+apk+download PDF link annotation
    • http://jokojujut.medianewsonline.com/google_search_history_on_iphone_7.pdfIn PDF document text
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/980aa86d3b.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/what_is_molecular_and_cellular_biology.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/tepurimowo.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/ijjLhgd/fidefafanem.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/operations_management_degree_courses.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/vugutomezafivon.pdfIn PDF document text
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/897e3f5c0938.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/job_interview_question_whats_your_biggest_weakness.pdfIn PDF document text
    • http://punejew.mygamesonline.org/the_lathe_of_heaven_synopsis.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/citizen_eco-drive_calibre_8700_diamond_mens_watch_-_bl8042-54e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rizivubonulej.atwebpages.com/robert_kiyosaki_business_books.pdfIn PDF document text
    • http://vumamuv.myartsonline.com/what_is_doubt_a_parable_about.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/nusitobatuv.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/catastrophism_and_uniformitarianism_graf_1988.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 2880 bytes
SHA-256: 619a44e8b5c2a2d3fc0e18259d8022938ad4f8b30552901bc68dc41c3d0f2ef0
font_01_sfnt_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 5428 bytes
SHA-256: 7abf9dd775844d849ee0f7903d2930ea7ba25660f7f3d3c080393ea2ea7c2ea9
font_02_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 3024 bytes
SHA-256: 85b3ebee3867e571d4ad065a8c6151e0aed3b29e31ca8c5b364b3b51e21f02a6
font_03_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 10368 bytes
SHA-256: af014a184434399d895aeaf9b615fcb8720fd04dc6aba7cb912df87ed073cc69

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