Malicious PDF — malware analysis report

Static analysis result for SHA-256 1459f450144e4dfa…

MALICIOUS

PDF

116.5 KB Created: 2021-06-14 03:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a41ff239426d89ebff43421074d52c65 SHA-1: 104f8a8d5286a5f0a6c3e6514bcca3a4e1c4a8b5 SHA-256: 1459f450144e4dfa031ff8fd0d98d27eaaa01d38e6a4234a9d8fa3c22c098e7e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to direct traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/123?utm_term=pakistani+bridal+pics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465396/normal_5ffed14e5dd04.pdfIn PDF document text
    • https://tozupetap.weebly.com/uploads/1/3/1/3/131383790/d6076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_6042ec332863e.pdfIn PDF document text
    • https://xemibunadagom.weebly.com/uploads/1/3/4/6/134639404/8628235.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/gupekejovilute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_60693ade2e950.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/c015cd5a-41e2-4914-bc97-709ab6b85f5e/henderson_county_nc_detention_center_mugshots.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/f/intermediate_first_year_telugu_academy_physics_textbook.pdfIn PDF document text
    • http://garigor.pbworks.com/f/48546046267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc49895-aeec-456d-992a-7e1432fa18b1/ti-89_titanium_fraction_to_decimal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a38df0-9aa2-41bc-890e-febb1bcc01c0/maxi_cosi_pria_height_limit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383eaa31-970d-4ad4-b569-3258241b4a9f/bazunepivejejajaledogapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38dc46f-4f38-447d-9a19-c90d4bbefebc/how_to_use_turtle_beach_stealth_600_xbox_on_pc.pdfIn PDF document text
    • http://fijokawowe.pbworks.com/w/file/fetch/145165857/79959884487.pdfIn PDF document text
    • http://fevosezew.pbworks.com/w/file/fetch/144973704/the_covert_narcissist.pdfIn PDF document text
    • http://tepuvewi.pbworks.com/w/file/fetch/145237053/21966326766.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/87966253873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bcea160-a90e-4b59-ba8e-42f80c757ebd/xozijogolofotegexijajosas.pdfIn PDF document text
    • http://tejudafo.pbworks.com/w/file/fetch/144460587/65235462877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae217e68-11a6-4c39-92dc-fe58027ffdee/tewumenadafu.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/f/ejercicios_de_factorizacion_de_expresiones_algebraicas_con_respuestas.pdfIn PDF document text
    • http://sulegiwi.pbworks.com/f/802.11_driver_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0dd0d6-6291-4528-990b-e82903e1904e/how_to_replace_samsung_washing_machine_door_seal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f6de315-7da5-44fe-ac89-a55baf4aa7bc/what_is_a_good_title_for_a_book_about_your_life.pdfIn PDF document text
    • https://www.alamy.com/licenses-anIn 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_off00018e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E1D 5272 bytes
SHA-256: b6f1a56939c75692d404fd07fadedd7ed38a4093df7ef50e880364d42b879c92
font_01_sfnt_off0001a011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A011 10804 bytes
SHA-256: 657d369a6cdfcd876f3e95b5f2acd452c0674faff2db1594a9860c172450b596

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