Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb7e21fda15befe…

MALICIOUS

PDF

76.1 KB Created: 2021-03-27 15:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 83e9b2e2283c6cd9375eb6cf436d7c31 SHA-1: a746221a066d5eec49aae4eafc840aff90198764 SHA-256: ffb7e21fda15befe1120b2858ca43b9427fee14f047ddca119f7f30a799a9f2a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://kuzutuzo.ru/123?utm_term=a+byte+of+python+epub PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5fcd8bb0ec9ff.pdfIn PDF document text
    • http://jirapunobos.22web.org/associao_de_resistores_em_paralelo_exercicios_resolvidos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_6031679edfa4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408990/normal_5fe02b7124dac.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480732/normal_6052a2796bdc6.pdfIn PDF document text
    • http://pepujolajerikur.66ghz.com/conjuring_the_universe_peter_atkins.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/vejepatito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_60515b29735b6.pdfIn PDF document text
    • http://health-top.ru/tumitaxerespvj0.pdfIn PDF document text
    • http://fionainthefield.org/pdf_splitter_to_jpg1cqer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490269/normal_5fe91d5086590.pdfIn PDF document text
    • http://iranomics.com/pathfinder_character_sheet_fillablepcasy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_603f3f620734a.pdfIn PDF document text
    • http://shoppermarket.online/why_isnt_my_jbl_sound_bar_workinggmqg1.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/9a0e3d44-7267-4d21-8f83-de985d73ea9b/new_ipad_mini_2020_price.pdfIn PDF document text
    • http://xaxotatizomeno.rf.gd/bogorikevokisoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2619d36-88af-491e-8c4a-a26f4978b780/gemezez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796af06f-2364-4e78-b02e-107c7be1bf88/jeziperemigo.pdfIn PDF document text
    • http://wevaxelim.rf.gd/assam_tet_2019_online_form_fill_up.pdfIn PDF document text
    • http://joboberunora.rf.gd/bise_sukkur_11th_result_2019.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_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 4704 bytes
SHA-256: 67849729b972f4408f4d74657b3f007dacecdbe8d3737e47a14a338e8af8fdf5
font_01_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 15940 bytes
SHA-256: 05ce5f6f616ea16ad7be8a3d874a68af545cc9af0df108212264fb386e473229

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