Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b0955565bce09f…

MALICIOUS

PDF

89.8 KB Created: 2021-06-05 21:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d37a33a71aeec84a4f4457f15cc78989 SHA-1: c6134e59e0a8d476600dc733fa6a4ebbdb338425 SHA-256: d4b0955565bce09f2bb55280405881736da58f1326a001100b061f653048d0a4
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/123?utm_term=evil+dead+4+full+movie+telugu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406463/normal_6012715f391a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_6017218d1d235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453719/normal_6007903817d14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_6046fc807525e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4404308/normal_60b3c3ea7d602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_6020349633029.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fce0e68c3cf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_601d5365dc323.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vamafob.pbworks.com/w/file/fetch/144662808/wibotarosewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a3e2439-ec48-4a28-9fe7-7b702815ca65/juegos_y_dinamicas_para_jovenes.pdfIn PDF document text
    • http://beratirupo.pbworks.com/f/nixegizu.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/crossover_symmetry_shoulder_fix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1c74fd-1d1e-48c0-b229-d3d386b405c5/ap_calculus_limits_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/854a2de9-8dbc-43e6-a522-7b6812fc0d3e/pabodava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef9360e8-3087-4de5-839d-1f02bbab8057/pafubuxejotuwafutar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1520c147-70d2-4596-bb45-ce4e57e6c7e6/todunedepolixikuvedowago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d2a4bba-a298-407d-9f3d-014064477cb7/81870514454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f5e827-7cd4-4459-950d-f9ea3e5c2870/myers_briggs_relationship_compatibility_chart.pdfIn PDF document text
    • http://dumogaluz.pbworks.com/f/suicide_squad_full_movie_download_in_hindi_480p_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bebb68c-8f60-49ee-b17f-a762f3444a9e/online_project_management_courses_uk_free.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/f/12735846613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77d6fea-7eb6-46a9-9130-e2731bc9bfe5/tinemabitow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0c1733-3a4b-404b-b836-1b430decb41c/25718828595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311d51b0-4c11-4d89-a975-996f98289cfc/wodugalijetuzu.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_off00011f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F11 5060 bytes
SHA-256: ae08df7be29276c6de1a12d4fc462a0e183d79f7ba332f778fd158c608896c5c
font_01_sfnt_off00013050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 12036 bytes
SHA-256: 965afbde72e8c19a07ae5f0f5f967d3ebc885c2f453c40c480f98f8651b413e2